Maybe we can talk about an example and folks can use it to illustrate how they prefer to do things. I will use a real world actual play one.
In a dungeon, two PCs wandered off on their own to scout while the others short rested (I know, I know, but they wanted to). They ended up encountering a hungry grick, which attacked. By some luck, the thing dropped one PC to 0. I decided to have the grick grab the PC and retreat to its lair to eat the PC, becuase it was a hungry predator. The other player ran and the captured PC was devoured.
Would you have done it differently?
In a dungeon, two PCs wandered off on their own to scout while the others short rested (I know, I know, but they wanted to). They ended up encountering a hungry grick, which attacked. By some luck, the thing dropped one PC to 0. I decided to have the grick grab the PC and retreat to its lair to eat the PC, becuase it was a hungry predator. The other player ran and the captured PC was devoured.
Would you have done it differently?