I have a situation in my story where my MC is going to be ambushed in his "den". He lives in a burrow under a tree with exposed roots in a mountainous terrain. There going to be about a dozen tribal warriors that surround the den and they're going to use a large rock to plug the entrance to the den and thus trap him in. Then they will torch the tree with him underneath. I've managed to get him out of another seemingly impossible situation while keeping the real reason why a secret. In this situation, the threat is suffocation which can kill him. I'm not likely to have an escape route because it's too easy and obvious. I want him to dig himself out but it doesn't feel clever nor does it advance the story. It's simply a problem that must be overcome. Once he get's out, however, there's the dozen warriors to deal with but I already have that sorted out. Do I lose anything by being generic in this situation or do I make overcoming some situations benign to keep his "escapes" from being too convenient?