strictly it's not hand to hand combat if you are holding a wrench. The interesting thing about when someone holds a weapon is they tend to focus on it too much and thus forget they have another hand (unless it's a two handed weapon) and a head (and mouth) and two feet (and knees and elbows and shoulders and forearms and shins and even belly!). Also they have to swing it (unless it's a knife and they use a stabbing motion) which is slow and given away by their body movement, so it can be intercepted. You are better off with a long weapon to keep the attacker at bay unless you can't use it properly of course or the enviroment is cramped...Of course there are ways to disarm weilders of long pole like weapons too...best weapon (not firing) would be a light saber ... but they don't exist. However, I've seen videos of Koreans taking out someone who is trying to draw a gun and shoot them from easily 5+ metres away - you need the gun in a firing position at all times (like in FPS games) and should never get within 3-5m of an attacker because they can intercept if properly trained - so many people make that mistake in movies and of course they get taken out by "Steven Seagal" or someone, or otherwise I'm just yelling "the gun is 6 inches from you, just move out of the way and grab it". If you think you can't move faster than a gun, then think again, the human reaction time is around 180ms, so it takes that long for the gun weilder to think "sh*t, they move, I'd better fire". That's 1/5th of a second and you can move pretty far in that time period, although in fact you really don't need to move very far at all to defend yourself.
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