Random Group Forum Inspiration

I haven't been on this site for quite some time, I have been busy with writing a fantasy story. But I have reached a point no writer wants to reach, I am in fact speaking of writer's block. So I have come to ask for some thoughts, ideas or anything useful because I've been stuck for about a month now.

So the 2 main characters are investigating the disappearance of a flock of sheep. In their search they've come across a demon lair deep underground and in order to infiltrate the den they've disguised themselves as sheep. They've been brought down in to a sheep pen where the sheep are being sold to the highest bidder. The problem is...how do the main characters escape with their lives and most of the sheep without fighting their way out?

Again any ideas or thoughts will be much appriciated

im sorry too for not being on this site either but @ scoxander i think you can use mortality for that like what abut if they become inmortal kids now in days actually like that kind of mystery of inmortality and magic or you can also add terror or better drama !:P