Thank you, everyone, for the IC posts. They are appreciated. Let's keep it going. I'll get one up for Katsina in the morning.
The 0 hit Demolitions test is not a crisis. It's not a glitch so it doesn't blow up in Sam's face. Zero hits simply means that the detonator+explosive combination doesn't work. ICly we can explain it multiple ways:
1) Sam not knowing how to use Doc's juryrigged commlink;
2) Sam's new (additional) dermal deposits making him clumsy and fat-fingered; or,
3) Sam's acidic secretions messing with the process.
There are two options:
A) Only rig one side of the valley to blow. You should still get a good avalanche, just not as all-encompassing; or
B) Have Doc do it. Demolitions is a defaultable skill and Doc, the Limitless genius, knows more about Demolitions than Sam, the trained professional, does. Thank you, RPG abstraction.