Ahh ok. Otherwise... I was assuming it was sent back wherever the monsters come from.
I think the monster's still there. ... The outline in panel three is probably to show that it's moved, not that it disintegrated.
Ah, got it. I thought the point of view had moved from facing Rue to behind her, and we were seeing the thrashing one disappear. Now it's obvious that the point of view only got a bit closer, and Rue has turned her head. Makes sense now...The one that's depicted as an outline in one panel is the one that is now on the roof - the outline is where it had been when Rue last saw it, blocking that end of the alley, before it went high to try to counter Zoe.