Scene 1: Since Gerson was little he was in the training of becoming a full fledge warrior as he was called in to look over and babysit a baby Asgore
Scene 2: Gerson was showing off his skills while training as he impressed the trainees like Arial and Bruce
Scene 3: Gerson was fighting the humans in the war as he was trying to evacuate the children, the elderly, or those who cannot fight
Scene 4: Gerson was taking care of things that might happen in the underground (Long ago, ASGORE and I agreed that escaping would be pointless... Since once we left, humans would just kill us. I felt a little betrayed when he eventually changed his mind. But now, I think... Maybe he was right to. 'Cause after all, even though we never escaped... A human's killing us anyway, ain't that right?)
Scene 5: Gerson was minding his own business when he sees (PS/N) was walking by
Scene 6: Gerson was walking around when he noticed a little Undyne following him around
Scene 7: There was a distress signal in a deep part of the underground when he saw what had happen it wasn't pretty