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Question on Crushing Blow and Knockback

I am thinking about a character that would use an A1 mercernary with Crushing Blow and Knockback.

I have collected information on this site, but I am still in doubt about a few points (I read different information) :

1) Basic facts :

I understand that Crushing Blow will remove 1/8 of the life of a normal monster and 1/16 of the life of a Boss/Unique when used on a A1 merc.

For knockback, the knockback will trigger 25%, 50%, or 100% of the time depending on whether the target is Big, Medium or Small. I assume that Diablo and Baal ar Big (25% trigger).

Am I right so far ?

2) CB in multiplayer games :

I read conflicting information on this point. Does CB scale with the number of players ? In an 8 player-game will CB damage only be calculated on the base life of the monster, or is it like static field caclulated on its actual life ?

3) Effect of resistance and Amp Damage :

I understand that if a normal monster has 50% physical resistance, CB will only take 1/16 of his life away.

If I Amp this monster (phys resistance drops to -50%) will it remove 1/8 (Phys res capped to positive) or 3/16 ? I read both so I don't know which one is correct.

Thanks for you answers.