First Aid wasn't sure when his feelings about Tarn had morphed from subconscious fear to open contempt, but Tarn does hit it on the nail; after the mech's behavior, he was far more scared of an unexpected presence in the alley than the mech himself. Combined with his good relations with Megatron and the mech keeping Tarn on a tight leash, he feels confident enough around him without concern for his safety.

He didn't even see the hand coming. He doesn't even get the chance to fully process it until his back is slammed hard against the bin and pain shoots through his throat. Damage assessments pop up on his HUD, reporting superficial denting to his throat. First Aid makes a small sound, fingers digging into Tarn's wrist to try and pry it free.

"I'm not the one who turned you into a joke! That was all you."