I did a play through again yesterday of Vigilante and I just realized, though I need to play through again to make sure, that the last boss is only exposed to a attack when his feet are in a certain specific position when he is taking a step forward or back. If I am right it would help cut down on that 1-2 credits I'd normally use at him to beat him because I usually just go wild and attack him with a volley of jump kicks and standing kicks and pray for results, unlike the other bosses that have clear and definite weak spots and patterns and can be walked all over if you take your time and attack them right.