[@13org] Speaking of magic i have a question about the gravity magic well a few

Ok, so when a hydra pokes its head out of the portal can she crush it with the weight of the entire monster or just whats out in her area I.E the head and if its just the head wouldn't putting more of its body through the portal for example more neck would she need to re-adjust. 

Also how would she know how much gravity to crush something under like how would she know how much force and energy to put into locking something down and just killing it under its own weight 

there is a whole lot of math we need to do to figure out how much downward force she is putting on a creature as well as needing to know the approximate weight