Apparently this is the original post in its entirety:

Here is the full story from what I have been told from a very reliable source.

First, Brock Lesnar was not expected to put over Roman Reigns on the microphone nor was he expected to be part of the segment that featured Daniel Bryan and Paul Heyman putting Reigns over. Rather, Lesnar was expected to be a part of the main event. Lesnar's walkout occurred in the hour or so following the Bryan-Heyman-Reigns segment. It is this reason why literally nothing of particular note to Reigns occurred in the main event aside from the Bryan tag-in which the commentators quickly put over as a bit of retaliation of what happened pre-Fast Lane now that they're all buddy buddy (Bryan-Reigns).

Daniel Bryan was made aware of the situation before he cut his promo. Before Bryan did the professional thing that was required of him, putting Reigns over, you can clearly see much more intensity in the promo. That was the makings of a very good promo. It was also cut straight from the hip from a guy who feels legitimately robbed of his main event status at Wrestlemania for the chosen one who really fucked up in a pretty big way.

Reigns failed the WWE's drug testing policy. The higher ups in the WWE were made aware of Reigns's failure early Monday morning.

Clearly all involved are very disappointed in Reigns. It has brought back discussion of Jeff Hardy's drug test failure prior to Wrestlemania XXIV where it was highly likely that he was to win his first championship (which was delayed until Armageddon in December). Many feel that Reigns should be forced to forfeit his position at Wrestlemania and take the suspension. However, Vince McMahon is backing "his boy" and made the decision not to suspend him as there is more than 30-days to go before Wrestlemania.

However, given the current situation in the UFC with the steroids controversy, Brock Lesnar is beyond infuriated with that decision. His legitimate fear is that should he choose to return to the UFC, quite likely given the money that Dana is offering, his Wrestlemania main event status against Roman Reigns links him directly to failed drugs tests in the media. It's a guilty by association issue for Brock and a perfectly understandable one.

Lesnar has demanded that Reigns be replaced preferably with Daniel Bryan or John Cena, both of whom he is happy to put over given their popularity. Lesnar does not particularly care if the much smaller Bryan were to defeat him - it's a non-issue due to the known 'scripted' nature of professional wrestling - as it wont effect his UFC reputation. Again, Vince McMahon has said that Reigns would not be replaced in the main event of Wrestlemania. Lesnar walked out.