See I think a good poker player know his or her weakness you knew you are weak HU.So why not leave at that point.unethical not really mabye play one more hand and fold then leave is better but you have the right to leave any time you want I am sure he is a lossing player.There are alot of worst things in poker you can do..

If the other player doesn't like the hit and run style of some players....he should play only in tournaments....lol

That's poker!