When we are talking about Umberhulks, I can't understand that they can

move, they look so big and clumsey, it can't be a hard task to run under the legs at the umberhulk and hit him from the back before he turn around.
I think that it comes from the dog food they are eating(dogs are fast and move easely) Are you geys not agree???
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Defender and master of Good archmagic