While your tame still might die anyway if you have a high hp dino that gets zapped by these whistle followall and swim away. If you can i managed to rescue my 140 rex that way. She had 8k health and lost around half with a normal saddle. I came back with my re and killed them with rock throw. (It was super effective)
If you’re in the water without a tame, as long as it’s shallow backpedaling is almost fast enough to outrun these suckers. Although their stun renders you unable to move, you can still stab it, and they’re squishy.