Can someone tell me what the Demolisher in Act 6 of Black heaven does? It's the one that's crashed upright in the ground after Gellimer explodes and while Athena Pierce rescues you. I stopped to try to click on it and something fell from the sky and killed me, so I walked to the end of the map so pomegranate would stop falling, but then the story continued without giving me a chance to click on it.

It's this thing:

But it had a quest bubble on it. Did I miss my chance to get the mount? I don't want to go through this pineappleing nonsense a third time it can be avoided at all.

Also, did they remove the Rien Strait Drillbot mount? I only received a chair for finishing Act 4.