Hermit Crabs Switching shells - video

I came home today to find two of my hermit crabs 'discussing' something, im pretty sure they were arguing over a shell, needless to say the one who was occupying the desired shell lost and was evicted, then (this is where the video starts) the evicted crab tried to take the empty shell...

I dont think the crab who stole the shell wanted to give up either one, or just make sure that he was making the right choice.