Billy and Bob are cruising through the water in their makeshift boat

Billy and Bob are cruising through the water in their makeshift boat. It is dark and they don't have a light. This, however, doesn't slow down Billy and Bob. Billy and Bob are traveling at 35 knots. There was a big storm that washed debris into the water way two weeks before this epic boating adventure. Wouldn't you know it Billy and Bob hit a huge piece of lumber floating in the water. It caused their boat to flip and flung them onto the shore. Billy was fine, but Bob hit a tree. Upon arriving at the hospital, we learn that Bob has a hematoma and it is pressing on his brain stem. Based on your knowledge of the brain stem, what symptoms could be present if damage to the brain stem occurs?