Normally Starscream would take issue with someone so rudely turning their back on him in the middle of conversation, and he has so many questions for this strange Decepticon, too- such as, consideration for what- but for once, he has the good sense to realize that he probably just narrowly dodged a bullet talking with this guy.

"Yes... er... My pleasure, Tarn."

Yeah he's going to go ahead and fly away now.