(Not my photo, just random interwebs share.)
I don't know if snails have enough brain cells to be actually terrified. (Science must answer this.)
Apparently sulcata tortoise hatchlings are quite fast because they're, you know, small.
But most turtle species are actually quite speedy compared to snails. In fact, some herbivorous turtle species eat snails for protein! Just to assert that they're the speediest of all. *chomp*
Knowing snails, it’s probably trying to determine if that turtle is edible.
(Snails are herbivorous, but very dumb.)
They are also not very edible according to fish, I've tried using them and got nothing.