enemies of the coin-op had some kind of inertia when approaching player.
I had the coin-op at the bar my sister was propietary of. When I got much of practice I had to use two credits to finish it =( but anyway I had never to pay for any credit =D
I got really amazed when I saw a copy for Amiga. My schoolmates and I played it a lot and got fun with the ending,.. which I found a lovely lite version of the coin-op... really surprised they squeezed all that stuff in one single-disk.
As for Double Dragon 2, fortunately it differs of the coin-op controls.. better for us.