They flying head was a...unpleasant thing to dodge, but Optimus quickly forgot about, distracted as the sparkeater's casing crackled away into nothing. The sparks within, weak and hurting, were freed to the Well, and the Matrix itself gives him a faint wave of satisfaction..

He doesn't fight the grin, engine giving a rev of deep and sudden happiness.

They were free.

Optimus gave Megatron's shoulder a squeeze, openly grinning at the mech despite his own pains.

"Excellent work."