Do you really want to trust Caleb with that kind of technology? I haven't even gotten to the "drop a washing machine on the Book of Secrets and see if that works" incident!

Pretty much, but I'm guessing it's because he's trying to make himself seem tougher in front of the girls. His rampant sexism aside, he's still just a kid who's been recently forced into this position as leader. Aldarn's probably the only person he feels comfortable being himself around--he's constantly got to play the part of Rebel Leader. I'll probably have to hearken back to this moment comes "The Underwater Caves," when all he can do is go on about how awesome his dad is (and no surprise--the guy IS Nightwing, after all).