Damn Vanaduke You Huge

So I was doing an FSC run earlier today, after the duke died, he suddenly disappeared without the purple explodey thingy and his corpse just popped out of nowhere. His corpse was also about 3 times his normal size for some reason. Idk whats wrong but just wanted to see if anyone has encountered this before.
http://cloud-2.steampowered.com/ugc/542930318617667839/49BA8FF7C8C471372...
http://cloud.steampowered.com/ugc/542930318617673898/03DE764F98094817F07...
http://cloud.steampowered.com/ugc/542930318617670507/714F2761FF5A98FC6FB...

http://steamcommunity.com/id/alanh/screenshot/506892556213971104?tab=public
http://steamcommunity.com/id/alanh/screenshot/505767392798911514?tab=public
http://steamcommunity.com/id/alanh/screenshot/577827436808473315?tab=public
http://steamcommunity.com/id/alanh/screenshot/578957862899926333?tab=public

http://steamcommunity.com/id/dukeplatypus/screenshot/595842156907512754/...
Vanaduke got trapped behind my lifeless corpse for the last phase. When he died, my corpse pushed him back inside the wall and into the foreground, making him seem giant.
Its been seen before. :3