Red was not the imposter, one imposter remains.

That's what was scrawled on the cafeteria wall. It huge messy handwriting and red ink.

Actually, it was blood.

Lime watched as Brown, their resident scientist tested the blood to see if they could gather any evidence. Brown placed the cotton swabs in a tube then stuck it into a machine.

"There, we should get our results in about two hours," Brown told Lime.

Two hours later the machine was broken and the test tube was gone.

Hehehe, that was short. 

Promise the next one will be longer.

QOTD: Should we even trust Brown??