I do tree work for a living , two weeks ago my boss was up in the bucket bout 60 ft up cut a branch out .I wasn t paying attention and walked under him the branch hit the ground in front of me , like a spear slammed into the ground hitting me in my left thigh then shattering the branch. It started swelling instantly and bruising. When the swelling went down it was a big nasty bruise. When bruise went away it still has a tennis ball size knot on my thigh.The branch was bout 4ft long and bout 4in round.It almost knock me of my feet.lucky it hit ground first or it would have broken my leg.If I would have been a half second faster it probably would have killed me .Why is there still a knot