So I was playing, and suddenly, the shark came swimming over to attack. I stabbed him a couple times, and then he started swimming in circles through my raft like it was nothing.
I wish I could have gotten it on video, but here', have a screenshot instead. (I can't get the image to appear, so here's the actually link)
http://img07.deviantart.net/5616/i/2017/065/1/1/raft_by_inside_our_mind-db1eea5.png