For example say in combat when rolling for the damage a player gets click-happy and manages to roll three separate damage rolls, per the FG manual I should be able to either right-click on the damage in the dice window select negate and then drag that negated value to the npc or character that took the accidental damage and remove it. The other option is to hold down CTRL I believe and drag the accidental damage over the npc or character in question, thus negating it. When I do it I see the cursor turn to a blood drop but I do not see the HP's added back to the individual.
This would not be a big deal unless I am not paying attention to how many HP's the individual has and then I am not sure what to reset the HP's back to manually. Once an npc or character hits 0 the tracker stops showing the effect, i.e they goto 0 not -5.
Does that make sense? maybe I am just doing something wrong. :)