From the Rooster Teeth Video, for the live gameplay demo, there were about 50 Sony Bend employees in the crowd watching (about half the studio). They were all on the edge of their seat hoping everything went the way they planned.
They did have a backup plan if things went wrong, a Plan B, but didn't have to use it. But there was one part, when he got up on the roof, where he was very very close to the edge of the roof and they thought he was going to fall off. So I guess it was pretty tense for all of them during that gameplay. I assume, falling off the roof = death.
This was huge for them as a studio, that stage, closing the show. They were all very excited, but very nervous. But it sounds everything went according to plan. So happy for them.
Think of it as giving Sony Bend views.