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It took me 3 days to defeat the Centaurs on the PC, probably because my 57 year-old hands aren't as quick as they used to be, but I did figure out a couple of tricks to make the level doable (NOT easy!):
1. I found out that if I was always moving from side to side I could avoid the firebombs, and when the the rage meter filled and one of them attacked all I had to do was hit the "duck" (shift) button to dodge (I also used the duck button to avoid being frozen --- the fewer the buttons to remember, the better);
2. I used manual combat mode for aiming (the automatic modes required an additional click before I could grapple the shield);
3. Instead of looking for the visual cue to know when to fire (the rings converging and turning red) I used the auditory clue (the "ding" sound) to know when to fire. That way I didn't have to be looking everywhere at once;
4. I switched to an old PS/2 keyboard and mouse I had in the closet because I discovered my wireless Logitech keyboard/mouse set was not responsive enough (it's one of their cheaper sets, not intended for gaming);
5. Mostly it just took a lot of practice to get familiar with the keys and taking breaks when I got frustrated.