Well, when Soren said "the episode played out as it did," he did mean it played out almost exactly as it did in the show. Despite being aware that this episode's course ends with the brothers saving Tommy and his friend along with Tommy's siblings, it was another thing to see it happen in real life.
Of course, he knew that the Wendigo was out there stalking the group during the daytime and the boys haven't yet figured out that it is a Wendigo. He was at least able to use his magic and his Hunter's Gear (Bloodborne) in case the Wendigo became more vicious than what was depicted in the episode.
Tangent aside, Soren followed along with the group's efforts to locate the supposed injured person away from the campsite and returned to see the ruined gear and packs. This scene did not surprise him at all, but for appearances' sake, he kept his expressions schooled on confusion and fear. With his enhanced senses, he could see and hear Sam asking Dean for their father's journal.
'Their old man at least knew what he was getting into with the Hunter's life,' Soren thought to himself as he saw the familiar worn leather notebook overstuffed with notes about various creatures. 'But I swear to the gods above, they need to get their heads into gear before the Butterfly Effect takes hold...'
Soren was not wrong for thinking about this since he effectively arrived days before the boys did and was fully aware of the existence of the Wendigo. This was far more than enough to have the world itself try to make up for his presence in this canon event and thus trigger a common phenomena with time travel: the Butterfly Effect.
Google it if your curious.
Then, before too long, Soren heard the boys say that their weapons were useless and Sam trying to convince Dean to tell the group about their findings. This meant he too had to get back into character and play his role.
Despite everyone else (not Soren, Sam, and Dean) not believing the boys, Dean began to draw the Anasazi symbols to ward off the Wendigo. While Dean drew the symbols to aid the campers in their overnight camping and Sam trying to convince (miserably) Dean to abandon this hunt to look for their father, Soren kept an eye on the real troublemaker of the group: Roy.
In the episode, Roy ignored the boys' warning about the Wendigo and fired his gun at it. Thinking he fatally wounded the Wendigo, Roy left the protected safe zone Dean set up and ended up getting his neck snapped with his corpse found by Haley the next morning. Soren was fully willing to let Roy suffer for his willful ignorance of their current situation, but he didn't know if things will continue the same way they did in canon.
'The screaming to draw out the group is soon to happen. Not doubt that Wendigo is going to try to lure them out of their safe zone, but if anyone else but Roy falls for it, I have the Imperious Curse,' Soren thought to himself as the Wendigo started its plan to lure out the group.
As one would expect, the Butterfly Effect was not in play this time. Roy, just like in canon, fell for the lure hook line and sinker as he ignored Dean's warnings--fleeing into the forest. While he felt no pity for the fool with the gun, Soren was not going to let further disturbances disrupt one of the pivotal moments in the timeline. This episode's plot (along with the one that started this decade-long road trip) would help shape Sam and Dean's relationship as brothers-in-arms that constantly save each other from the monsters they hunt.
'The Wendigo has served its purpose,' Soren thought to himself as the others soon went to sleep for the night. He checked the progress in the current scenario via his System logs and found out that it was almost over.
All that was left was for the brothers to kill the Wendigo and save Tommy from its lair. With that, he quickly found a place in the site to sleep for the night.