I have a woman murdered when she is hit on the back of the head with a metal trophy. The trophy is cup shaped so the largest part of it is a thinner metal. I expect the trophy will dent from the impact, but I’d also expect that there would be blood as a result of the injury. Would this kind of injury cause bleeding and if so can you give me a general idea of how much?
It depends. Blows to the head can go either way. They can just cause internal bleeding (intracranial hemorrhage) and/or an external scalp laceration that would bleed A LOT depending on it’s size and depth. Scalp wounds are known for being pretty bloody.
These injuries can be nice for your character as you have some leeway medically to do them in as you please.