I'll try one.

Two divers enter a small system with viz about 10 feet. They follow the mainline for a nice easy dive. Backmount doubles. About 400 feet in the line rises up from the floor and goes overhead. This area is rather restricted with little clearance between floor and ceiling, but enough for backmount to get through. Silty too. Shallow at 18 feet deep.

The lead diver feels some resistance as if the current is picking up, kicks a bit harder and soon can't move forward at all. He figures out it's the line wrapped on the right post. He reaches back to unwrap it and the small tight area coupled with the tension and movement causes a sudden painful leg cramp just as he disengages the line.

The line goes twinging off into the void (under more tension than first suspected) and the leg cramp causes a reflexive straightening of the leg that sends the diver off to the opposite side in a huge cloud of silt (current is almost nonexistent, the silt cloud won't move or settle). As bad luck would have it the diver also rises up right into an overhead fracture and soon finds himself vertical and stuck tight with a cramping painful calf muscle. Depth at this point is about 4 feet (floor is down at 18 feet), viz is zero.

The buddy sees the line suddenly jump to the left about 6 feet, his buddy jerking and seemingly "pulled" off to the right disappearing in the resultant silt cloud.

Now what? What should diver do? What should buddy do?

-skip