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Script: Weapon/health exchange

Q (sheathe) + F (pick up) = get random weapon (costs 6 HP)
D (block) + F (pick up) = recharge current drawn weapon (costs 10 HP)
D (block) + G (drop weapon) = exchange current drawn weapon for HP (the amount of HP depends on how rare your current weapon is and how much stamina/ammo it's got left; on-level pickups like chairs and bottles do not count as weapons)