Lets say I encounter a marauding Owlbear. As it is a magical beast and I know a few things about the arcane I make a knowledge arcana check. I get a final result of 23 giving me two pieces of useful information (as I beat the DC 14 check by 9). Now sometime later that fight I cast Heightened Awareness on myself (maybe the owlbear hid and I really want that +2 to perception)
You enter a heightened state of awareness that allows you to notice more about your surroundings and recall information effortlessly. You gain a +2 competence bonus on Perception checks and on all Knowledge checks that you are trained in.
How does the +2 knowledge bonus interact with my knowledge of the Owlbear. The SRD states (In reference to knowledge checks):
Retry? No. The check represents what you know, and thinking about a topic a second time doesn’t let you know something that you never learned in the first place.
Do I reroll it since my bonus changed? Do I add my bonus to my old roll? Do I gain no new knowledge? Does some other thing occur?