Blood for the Baron!

Optimus: One shall stand...
Nemesis: ...One shall fall.

Soundwave: Your shield cannot resist my sonic attack forever. Surrender.
Cap: I don't know how to do that.

Cap: Optimus! If Soundwave's attack is sonic, it can...
Optimus: ...take over the symbiote, like Frenzy the previous time! Well thought, Captain!

Optimus Prime and Captain America thrust both Decepticons in collision course against each other.

The collision causes Soundwave's weapon to lose control and affect Nemesis Prime.

Nemesis: I am defeated... but this is not my end... I will find a way to return and finish you, Optimus... Til all are mine.

The symbiote separates from the truck and vanishes in the darkness. The Decepticons have been defeated.

Later...
Spidey: Why I'm not black-clad anymore?
Optimus: Seemingly, Soundwave's sound wave also reached you and separated you from your symbiote.

Wasp: And why Carnage still has his? He was also near.
Ratchet: It seems like Kasady got some wounds the first time he was captured, and his symbiote bonded to his blood. It cannot be separated from him.

Cap: Spider-Man, the offer is still on. Do you want to join the Avengers?
Spidey: Sorry, Cap, but I still have a lot to learn about what you said: with great power comes a great responsibility. If I had accepted the responsibility, my uncle and aunt would still be here. Maybe I could accept some day, but right now I have to think.