How is the rider not crushed to death?

Paint it blue or find a blue one then max out speed and call it sonic

So I found a max level and decided to take it back to my base and drop it in my taming pen that is built on a raft. I waited for the starvtimer. When it had starved enough I started to feed it but the poor thing somehow glitched of the boat and drowned

I was trying to tame this one near the beach it eventually went into the water and curled up then he drowned how could I cause a armidillo to commit suicide