Steve's just pissed off because they took his hat.

:-)

But yeah, Danny's thinking God, this is what I get for hanging out with Steve, and Steve's pissed off at himself for letting this happen and figuring out his and Danny's best shots at survival and planning (eventual) retributions for the hijackers. Multi-tasking, in a scary kind of Do Not Get In My Way kind of McGarrett way.

(I too wish to know what's going on with Steve's knees...)