The way I understand it, they don't stack, but they act in separate layers of knock resistance. So the knock down would check against one, and then if it succeeds, check against the other.
Example:
knight has defensive support 5 (65% resist) and steadiness 5 (25% resist).
the knight is kicked, and there is a 65% chance defensive support cancels it
the random number generator decides that defensive support fails, so the kick then checks against the 25% resistance from steadiness.
65% + 25% would mean a 90% chance to resist knock downs, but applied in this way it's a 65% chance and then a 25% chance for the 35% of the time the first resist layer fails; meaning it's only a 73.75% to resist knocks overall.
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