You can't crawl unless you are thinking of Mini Mario which is when Luigi bonks Mario on the head with his hammer to make him mini (this move was in Superstar Saga:P)
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You can't crawl in killzone but you can crouch though.
You can’t you can only crawl on pc wich is computer
You crawl by holding down square, or reload, for 2-3 seconds. Remember, you move slow.
Tax return gets you $100,000.And crawl pimp unlocks every truck meaning you own them
You crawl because if you breathe in too much smoke in could really hurt hurt your lungs and you could pass out.