in case no one posted it, the reason he started drownin apparently was because the water was 'low' enough to where you could walk through it. this is why his arms were splashing how they were at first, and someone said he was walking or whatever. but, near the middle, there is a large drop, and when he got to that point, he obviously would've needed actual swimming skills, so he was in trouble at that point. this is why it's important to think before acting, especially if your life could be at stake.