Leech on Their Body :((

On my book, Vern, Chris, Teddy and Gordie have a lot of  adventure. When the young boys are on the bridge, the train is coming and then they start to run but Vern doesn't want it because; he was afraid the bridge and he wanted to go another way. Gordie helps to him and they go out of the way's near. After that they walked on the lake but suddenly they get down on the lake and when they are near the lake, they see a lot of leech on their body. I think it is bad, well. But in spite of everything they want to see the body.