RedactedNarrative: A witness, who was assisting with the dredge operation stated that: Watercraft #1 (a pontoon boat) was tied to the dock. The dredge (entered as WC #2) was operating and the lake bottom gave out under the dock, causing the dock and WC #1 to be free floating. The dredger was shut down and stopped at that point. The owner of WC #1 came out, got on WC #1 and unmoored the front of the pontoon boat. It was breezy, and the front of WC #1 started to drift towards the dredger. The witness got into a flat bottom boat to assist in getting WC #1 away from the dock and out of the area. A mooring line was thrown to Owner #1, who was now standing on the back of the boat, near the boarding steps. The witness stated he believed the front of WC #1 then hit the front of the dredger near the hydraulic lines, just enough to knock Owner #1 off balance. He fell into the water at the front of the dredger. When the owner tried to get up, the witness saw a large laceration on the man's leg. He helped the injured man into the flat bottom boat and brought him to shore. He was taken by ambulance to the hospital. Life jackets were not being worn and alcohol was not a factor. There was no damage to WC #1 or the dredge.