HumanoidRootPart massless is causing another player to die locally

So I made a detain where I have to turn off the HumanoidRootPart becasue it is the heavies part in the player and is causing the detainer to fall into the ground. But when the detainee resets on his screen the detainer is dead. And I don’t know how to fix this problem really. I tried many things but none of them worked. If you’ve got a solution then please post it. (The detain is weld based).