first off....the adamtium skeleton works with hinges etc...second his skeletons' been bonded at the molecular level...this is why when a full speed stealth bomber hit him in the back it didn't make his vertebre slip out of place (before you go crazy, i want to say I realize this doesn't make any sense, how can logan move? I dunno..but that's how the character's been presented, and any oppinions on how ludicrous or ridiculous the notion of his skeleton being bonded together is, is moote the fact is, in the MU his skeleton's bonded...so that's that...)
third...wolverine's a master of all forms of combat...do you know how hard it is to immolize someone's arms by grabbing them at the wrists when they know a good bit of martial arts? it's near impossible...against wolverine' who's a master of all forms of h2h combat...and is boasting those wickd claws..that will be a hard task to accomplish...and what if logan kicks namor there first?....who's got the faster acting healing factor outside of water?