In PD25, your death is completely unrelated with the death of the button. You can die and still pass the Test. I learned this the other day when I accidentally fell off the center platform and got hit by a Bomb that had landed down in the pit. But since I was almost done with the Test when that happened, it ended shortly after I had respawned, and fortunately none of the Bombs were in a position to hit the button. Little Igor was still able to retrieve his prize, for trying so honourably.

Oh yeah, and when I said you should use jumping to your advantage on 25.0 (rather than just walking) ... don't try that in Nightmare Mode. The Bombs are spit far too frequently, and if you jump just once, it's likely you won't have time to get to them all after you land.