"That's the individual spirit a real potion-maker needs!" said Slughorn happily, before Harry could reply. "Just like his mother, she had the same intuitive grasp of potion-making, it's undoubtedly from Lily he gets it ... yes, Harry, yes, if you've got a bezoar to hand, of course that would do the trick ... although as they don't work on everything, and are pretty rare, it's still worth knowing how to mix antidotes ..."