He is not amused.

I got this crazy idea when I watched that episode where they were doing photoshoots in swim wear or something... Anyway, Barnaby was amused, Tiger was not...

Then it hit me...

This is a photoshoot where they dressed up as each others' persona-thing... Wild Tiger as a cute bunny!

Reporter: Mr Collateral Damage, what do you think of your outfit?

Kotetsu: Huh? Collateral Damage, Hey!

Please don't kill me, Kotetsu.

I can actually imagine Barnaby in the background trying to suppress laughter.