If another survivor is insistent that you do something, it's probably best to trust that they have a good reason for insisting on it. For example, if another survivor insists you heal them even though you would prefer you finish the nearly done generator first, they may be 99'd and just need a tap.
If you're not death hook and your teammate that being chased by Freddy is, you should heal without waking up so that he possibly teleports to you and leaves them alone. 3v1s are never an ideal scenario