I'm no authority on it, but I personally consider dropping below 50% and falling to be a sign that you need to get out of the fight, not that you need to stand your ground and keep hitting. I doubt that the two or three stronger hits you'll get in before you go down will be more effective than backing off, healing and coming back at standard strength levels in a condition where you're actually likely to survive.
Also consider that so far as I know it doesn't count shield HP, so you're really more like at 1/3rd to 1/4th total HP by the time you hit that point.
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Also consider that so far as I know it doesn't count shield HP, so you're really more like at 1/3rd to 1/4th total HP by the time you hit that point.