You cannot knock these out don’t try you will just kill it I advise to take a megalosaurus and pick it up and put it and a stone two by six with walls three high and ceilings Then put a Dino gate on one side and feed it through the walls. GL happy taming
Easiest and safest way to tame this is to lure it under water. They stop aggro and you can tame as you please. Just make sure you come up for air every once in a while. Also be sure the water is deep enough.
SUPER EASY TAMING!!!...Best place I've found to tame high level Arthropeluras is the cave of the Hunter on the Island, aprox lat 80, lon 53. I usually take a mate boosted pair of Baryonyx, find the large water holes, kill everything that attacks you using the Baryonyx tail whip attack (great for sarcos), once everything is dead look at the bottom of the water, usually there is 3-4 Arthropeluras laying still, THEY WON'T ATTACK YOU! proceed to feed rotten meat (I recommend broth of enlightenment), and enjoy your new demolition dino. PRO TIP: If you're looking for a level 150, kill everything in the cave, leave render, return and there should be fresh spawns. Rinse and repeat 😊 Happy Hunting - Sanch3z