(You can guess that this was inspired by Shakespeare's Romeo and Juliet. Beware, anthropomorphic animals are included here)

The two mice fought ferociously, swords clashing like snakes trying to strike one another. Their eyes glinted with red fury, tinged like hot coals in a flaming fire.
Arsvolio struggled to pull Pugnatio from the fray but he was not to be moved: his eyes were fixated upon the snarling Lybolm whilst metal struck metal. Desperate with trepidation, Arsvolio was forced back and he watched, crying out for them to cease their foolishness, his voice hoarse with fear.
"Pugnatio! Halt thy folly or thou shalt be injured gravely. I beg thee, good and gentle Pugnatio, put up thy sword!" his words had no effect upon ears deafened by merciless loathing.
"Cease good Pugnatio. Heed thy friends words!" Sorentio seconded Arsvolio urgently, tail lashing with mounting apprehension.
Lybolm smiled, facing Pugnatio, his teeth revealed in a leer "ah..." he addressed his opponent personally "thou spirited body hath caused thee to fight this fray against I. Be  warned, foolish Pugnatio lest thou body, when this bloody hatred hath been fought, mayhap shalt breathe the last air."
Bleeding from a cut above his eye, Pugnatio scorned "and thee, Lybolm, thou soul shall ascend with mine if true ring thy words! If I be slain, then slain art thou too!"
Their swords clashed once more, meeting each other as two eyes bored into different brains, crimson hatred glowing there within each coal black, dilated pupil.
"Hie thee away, knave!" Lybolm lunged, his blade slicing into flesh as a knife slices into meat. Pugnatio uttered a soft cry of shock, his eyes closing with agony.
"Pugnatio!" both his friends screamed as the valiant mouse fell to the ground, clutching his side which was steadily dripping, crimson droplets staining his once sleek fur.
Lybolm's sword was tipped with blood, rose red though the scent was not as sweet. Grinning down and staring at the dying Pugnatio, the triumphant rival spoke "thou art a saucy fool, boy, to meddle with my steel. Now, thou blood shall be witness to thy death." He backed away, eyes focused upon Pugnatio before turning away and walking down the street.
Pugnatio's friends fell to their knees beside the stricken body, tears threatening to spill like the bitter sad dew upon grass.
Pugnatio spoke, his voice broken and choked, breathing irregular "I am spent, peppered and gone from this world. The sky above doth sing for my spirit and I hear...mine ears are witness to Angels calling a name and my duty is to respond... Ah, sweet is the light that shrouds me like a veil. Ah, sweet is the fading pain... Adieu, good Sorentio, good Arsvolio..." With those words having been uttered, his last breath faded away like the stars slain by the envious sun and his eyes, once vibrant with youth, became dull as death clouded over, killing the last glimmer of life.
Arsvolio gave a stifled choke of grief and placed a paw to his eyes, unable to accept Pugantio's untimely passing. "Oh, he hath gone too soon. Such a youthful soul, too bold for this world, hath flown willingly unto the next" the words were uttered in denial.
Eyes brimming with rage that had overpowered the first grief, Sorentio glanced up "Lybolm, thou coward of Delilah. Thou poison among a pit of snakes. Be scarce as the snow that falls during June, lest found by I, will thou be forced upon my vengeful sword!"
The hazel furred mouse, crazed by fury and maddened by mental agony, rose to his feet, a paw stained red with Pugnatio's blood. He stared at it, trembling as he murmured "upon me, doth the justice for Pugnatio depend. Lybolm, whose actions bear no difference to that of Goliath, hath slain my dear friend. Not a blink of rest shall I take, until this paw, red with his blood, shalt be red with the life of the one who dealt him death!"
Arsvolio looked up, having heard his cousin's words, and spoke "nay Sorentio. Thou art mad to conceive such foolish antics. The fiery Lybolm hath, with murderous intent, slain our one true friend: yet, turn thee not into a reflection of him. Become not a beast with his merciless brain. Keep thy innocence and let no crime soil thy youthful and vibrant life."
Torn, Sorentio gritted his teeth, expression one of a tortured creature. Mind made up, his voice was a knell, ringing with wanted justice "my life shalt be soiled if be it without vengeance. The blood of Pugnatio sings to me from the ground; thou words urge me to mete out the same punishment that Lybolm hath meted out to a dear friend. Cousin, thou pleas are deaf upon my ears, thy words bear no meaning to a creature whose mind is fast set upon one intent: the death of Pugnatio's murderer!"
Clenching his reddened paws, Sorentio tore away from his cousin and the corpse, his footsteps sounding quieter until they faded away. Arsvolio, face stricken, rushed after his stubborn and crazed cousin, crying out his name though in vain.