Normally, Decade doesn't have a radio receiver in his helmet. The Sensoriums, though, apparently provide one when necessary. So, hearing Tycho's voice inside it was...disconcerting, for all of a second.

"'Unidentified?' I'm Decade. Kamen Rider Decade. Remember that." And for sheer emphasis, Decade pulled out his RideBooker and switched it into a gun. One *ATTACK RIDE! BLAST!* later, a TIE fighter blew up from a hail of laser fire.