I was doing the Predator Challenge "Top of the World", and some weird glitch happened. I was outside on a gargoyle, and with no ledge below me, I got the Inverted Takedown prompt. I used it, then swung over to another gargoyle where another Inverted Takedown was randomly. Weirdest glitch.

Also, I cut the ropes on one guy's hanging place, and he fell all the way down. Batman just killed! lol, but seriously, that was weird.