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A man was out and about with his grandson. The little boy suddenly had to pee really urgently, but needed help opening his pants. When the pants were finally open, the pee came flying through the air like an unrestrained water hose and caught the man on his finger.
This moment came as a complete surprise to him and he reacted to the spot where the pee had hit him with a defilement of the dermis, so that it was intensified from that moment on (cell plus).

It is interesting to note that he has previously experienced different and much more intense elimination situations with his own children without any symptoms (e.g. washing out cloth diapers in the brown discolored water etc.) and he is actually rather tough when it comes to this elimination issue.
What was different about this situation, however, was the element of complete surprise that caught him on the wrong foot and started the SBS.

Some time later, the SBS dissolved and the reinforcement of the dermis was broken down again. Stinking pus forms in the old mesodermal tissue. The process is often extremely painful, as the degradation, pus and swelling put a lot of pressure on the inflamed area.
One to two weeks later, the process was complete without any interventions or ointments. He was relaxed the whole time as he was familiar with the 5BN, knew about the conflict-resolved phase and was able to assign the cause beyond doubt.