Taking place in "the darkest hour"

With megatron and the decepticons preparing to destroy the autobot base, optimus prime orders bulkhead, arcee, bumblebee, and smokescreen to escape with Jack, miko, raf, and you.

When you and smokescreen are the last ones to escape, smokescreen can't stop thinking of what will happen to optimus.  He stops with a skid.

Smokescreen:  get out, y/n....
You: why?
Smokescreen:  please!

You did so hesitantl and smokescreen turns from alt mode to cybertronian.

Smokescreen: optimus may be in danger. You have to run where no con can see you. And put your cellphone on silent!
You: be careful,  smokescreen.

Smokescreen ran back just as the portal is about to close! When smokescreen came back, he is shocked to see that megatron already destroyed the autobot base and worst of all..... optimus prime gravely injured!