That's true. We see this a lot with knife wounds, even in the heart. The knife goes in and goes out and most people, the skin and fat tissue will immediately close up, you know, there isn't a hole left. It is a slow process for bleeding to occur through the body.
Superficial cuts on the hand bleed very much, and this is sort of a superficial cut because there's no skin there to come together from elasticity, so that's why cut wounds bleed more than bullet wounds because the bullet goes in and the skin elasticity and the outer most tissue underneath it close it up.
So when he is shot in the front, the blood doesn't start to come out right away. It could in a few minutes, but he collapses to the ground. And you can see in the head, there wasn't blood matting the hair, although there was bleeding that came out.
I can see in the scene photograph there was some blood coming out gradually from the top of the head, but it went downward and didn't mat the hair up. It wasn't a massive amount, it was a small amount.
So that I think that in the normal course you get very little blood coming out if a person collapses right away before death occurred in this case, because of that final shot.