Allied Roller "helping" The Enemy On Invasion

[caskindragon]

http://steamcommunity.com/sharedfiles/filedetails/?id=244521265

The scenario: started an invasion mission on the Grineer side, to cut a long story short, the roller knocked this Fusion Moa (center right) off the walkway, who then landed like so.

The Moa could continue to fire at me when I stuck my head over the edge (I could even jump off and land on its head, it wasn't too pleased with that situation), however my conventional Akvasto could not damage it. I appeared to be able to damage it if I fell underneath it, but then I was teleport back up as always. For some reason, my Paris was able to kill it though, maybe the punch through helped? I don't know.

(apologies if this has been reported before, I couldn't find it anywhere if it was)