Here's my take: I sincerely hope that was part of the story because if that wasn't then that would be Brock over-stepping his boundaries considering there is "supposed to be" no blood used in matches within WWE.
Personally, I think the ending was too much and I give Jericho credit for standing his ground and questioning Lesnar's actions and the finish.
I have a suspicion that this will lead to a rematch at WrestleMania as that's the only real place to do that and probably where Vince will be able to afford to use his cheque-book since that's all Brock cares about.
Phenomenal athlete. No doubt. But if he's supposedly the best he should stick around more and prove it week in week out. This is why I did not respect his last reign as Champion because he only showed up when it suited him which in my opinion degrades the Title.