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Tactics Instant seal?

There's really only 2 ways to effectively Instant Seal:

1) Watch the Dwarf as he's opening the cave with a dynamite ready to drop. This can be risky if you get to twitchy, I once accidentally bombed a dwarf after he opened a treasure cave, for example. However, without slowing time, it's the only way you'll react fast enough; especially on harder difficulties and with water.

2) A quick trigger finger on that space bar. With good enough reflexes you can act in time to Instant Seal a Lava/Water Cave, even when you were holding S when it was broken open. You can only do this so often though, so if your Dwarves are opening caves one after the other, you'll only be able to freeze one.
 
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