[Shiro might have taken it more seriously if Guzma had looked like he was in any kind of pain, but since he's just trotting off to the shore Shiro is going to just laugh it up while he follows after at a walking pace.]

I dunno if any 'beat downs' would even happen, kid.

[Yep. If Guzma's gonna call him an old man, then Guzma gets called a kid.]

For one, I'd rather not fight if it's not necessary. Two, it looks like you're having enough trouble as it is.