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As a man myself, and I don't mean to praise the evil killer in any way, but I think he was very brave to take on TWO girls. People I mention the case to say the same. Why not let them go and wait for just one as one's much easier to overpower? What if one had been selfish and left her friend and got away and could identify him? He must have been armed with a gun or knife to feel that confident. Doubt I'd take on two teenage girls as these weren't little helpless kids, but teens who surely will fight back, but then am not a monster or a rapist or killer. Anything could have gone wrong from his point of view. In fact it did as she got audio and a pic of whom we assume is the killer.
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I have seen that someone hyped up on Meth or cocaine is very powerful and agile, in addition to being irritable and angry.