You block.
Then it's blocked worm turn.
If he gets out, gets his crate and doesn't attack -> you get your crate next turn and don't attack
If he doesn't get out at all -> you get your crate leave his untouched and not attack
If he gets out, gets crate and attacks -> you take a 5 second penalty and you can attack if you manage in 10 seconds
If he gets out, with barely any time left and falls while trying to get his crate -> apply common sense