One obvious possibility for any power outage is that its source is external to the building. Coming from someone who claims it is a strawman argument that anyone has suggested a conspiracy - even though that claim has been made directly and indirectly by many of your nutty kindred
The strawman is the vast fantasy conspiracy of thousands who meticulously planned every little detail of what happened that day and the months leading up to it. That's the one you keep invoking in your counter-arguments, and yes, you are nutty to keep inventing it.
Because the sign was working - regardless of whether it was on the same or separate power source as the TSBD - that tells us there was no external power outage to that location. The sign is relevant in ruling out that possibility.
Cool, you've ruled out that possibility. Now how about actually supporting your claim that there was not a power outage of any kind and that Mooney just didn't know how to work the elevator and neither did Adams (or what excuse did you use for her?), and that Hine was talking about lights on her phone?