The hillock would be safer.

With the size of that wake you know that something large is under the water and so start to leg it towards the hillock. Wading through waste high water is not easy and you can see, looking over your shoulder, that what ever it is it is gaining quickly.

You try to pick up the pace lifting your legs up out of the water and taking long strides. Then you stumble, you trip and fall face first into the water. You take a mouthful and accidentally swallow the fetid water. Gagging you struggle to your feet and run another couple of steps. The mound is almost in reach where you could make your stand.

You feel the water rise up the back of your legs as the wake of the creature reaches you. You manage to get one foot onto stable soil and then feel something hit your back. You land hard spitting up water as you have the wind knocked out of you. You try to roll over only to find something large, slimy and wet sitting on your back, it's slime sticks to your skin, clothes and hair and you struggle to look over your shoulder to look at what it is you are dealing with.

It appears to be a large slug like creature holding you in place. It's slimy body prevents you from turning around. You suddenly wish Lenny was here as you feel the creature shift and a set of jaws go to work on your clothes. You think back to your training and wonder if this is a different kind of slime to what you have encountered before or if it is an entirely new species.

As you are thinking and struggling you feel the creature move about, nibbling at the back of your clothing all the while making sure it's sticky body is in contact with your's. It only takes a few minutes of your helplessness before you feel your clothing loosen and start to fall away. Inch by inch your body is revealed and you once again find yourself wishing Lenny was here. Although, you think to yourself, if he was he probably would be asking for a blowjob in exchange for his help.