I have played a league match against another club where the server was hitting very soft, short 2nd serves. The same guy was also poor at judging the ball when at the net. Therefore, I hit a lot of balls straight at the net player. Most were hit from 3/4 court (just in from the baseline) so it wasn't too dangerous. If I was at the net, I aimed for their feet. Although this play wasn't challenged in any way, I think some opponents would probably protest if it happened too often. This protesting could be used as a tactic. What is the done thing at high club level?