To dream of attacking someone by kneeing them represents awareness of yourself enjoying being reckless with someone else’s feelings. Having no remorse for your actions that hurt or embarrass someone else. Honest feeling about others being simple, stupid, or weak which you believe gives you the right to be reckless with their feelings if it suits your needs. Feelings of being superior that make you feel you have a license to be reckless with others feelings.
Example: A young man dreamed of kneeing someone in the crotch and being surprised that they liked it. In waking life he embarrassed someone on an internet message forum with a secret account to hide his true identity and the person he tried to embarrass surprised him by being friendly to him.