And so what the oxygenine nine hole does is it stabilizes this tetrahedral intermediate. Now, because of the instability of the tetrahedral intermediate, it's not going to exist for a very long time. And what that means is it's going to very quickly collapse. And when it collapses, what happens is the lone pair of electrons on the oxygen forms a pi bond with this carbon and that breaks off this relatively weak nitrogen bond. And so when this bond breaks off, the electrons on those bond on that bond basically move on and grab this H atom because by grabbing the H atom away from this histidine, this loses that positive charge and becomes more stable. And that can be seen in this diagram here.