When using prismatic crystals on Spireshell Snails in Nazjatar, if you go into battle, the snails will sometimes revert back to their normal slow speed. This makes a wasted use of a Prismatic Crystal since you can’t get the snail to the Ravenous Slime at quickly as normal. It also means that you’ll run away from them and they’ll despawn from you.
I’ve had this happen with other critters as well. As soon as I enter combat, they slow. When I leave combat, they continue moving at the slow pace. If you can get them close enough to the slime so that you can stand on top without the critter’s despawning, the critter will teleport to it.