It's the movement of Bulkhead's arm that finally pulls Sentinel out of half-consciousness. Appearing back on Earth and landing on the green idiot on Optimus's team would be embarrassing but at least he'd be back in the right goddamn universe. He vents heavily before propping himself up - still on Bulkhead's chest - and... notices the helm difference. Drift is there, too.

Sentinel goes to grab Bulkhead's chin guard to pull his head closer for a better look. Maybe he just hit his head really hard and is hallucinating a weeb and the wrong helm shape. Or maybe Liege was wrong and he's still stuck on this Pit forsaken Cybertron. Please, god, let it be processor damage.

Yelling will happen when he's over his stunned silence. This isn't what he expected at all.