But what if he's got a BoH in his BoH, with another BoH in this second BoH, Ad Infinitum? All but the first are opened, and when he opens the first...
Then, have him put his stitched flesh octopus familiar in the first bag (after pouring a bit of water out of it) and walk away. He can then at any time command his octopus familiar to swim down towards the deepest bag and pierce it, thus setting of a chain reaction of bags bursting and water flooding.
Spoiler: Lame pun
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Now that's what I call a Hydrogen Bomb!