The concept of alternate realities doesn't shock Tarn in the slightest. After all he has seen and heard the past few days...he's not sure there is anything Dreadwing could tell Tarn that would surprise him.

He makes an indistinct noise of thought. So far in Tarn's eyes, this version of Dreadwing seems like a good fellow. Reliable. Well spoken. An upstanding Decepticon.

"Mm, yes i heard news of Starscream's rise to power on Cybertron. Temporary business, I assure you."

Although with Megatron now an Autobot...perhaps his thoughts on the matter will need to be reevaluated.