He was pking in a Bounty Hunter world and was apparently risking quite a bit (by my standards, over 70m). He was fighting someone who was using full void, a rune bow, and dragon bolts. He was KO'ed by a hit near 600 (not sure of the exact hit), despite the fact that he was using the Protect from Missiles prayer. Now when I first heard this story, my reaction was to tell him that the Protect from Prayers don't stop damage from hitting you, it only reduces the chance of the attack actually hitting, exactly like defense. He argues that it in fact does lower the damage you take from hits, and that this in fact was a "glitch" in the game, because with his Prayer, the player would have had to hit approximately 840 (600 X .4 = 240, 240 + 600 = 840), which he and I both agreed, was not possible with the gear being used. I didn't a small amount of research and came across this on Runescape.com's manual:
Why is it that my protection prayers do not always work against another player?
The protection prayers will always work against monsters. These prayers do work against other players, but it will reduce the damage you receive by 40%.
Of course this made my jaw drop. In my 5+ years of playing RS, I always thought Protect From Prayers had the same effect as defense. So I now ask you TIFers, are the Protect From Prayers absorbing our hits, or are they simply lessening the chance of us hitting?
tl'dr Do Protect From Prayers reduce our chance of hitting, or reduce our damage dealt?