The Glasgow Block

So basically my understanding is this is sort of the opposite of the OT contingency. When the innies would normally activate when going into the area of the severed floor, the Glasgow Block keeps them from doing so.

But this begs a question. If they really are outside why does Helly need the Glasgow Block? As far as we know the only way innies can activate outside is with the overtime contingency. But since Helly was actually Helena she had no need to activate the overtime contingency, since that would have activated Helly. So if that's the case why did Helena need the Glasgow Block activated while outside.

I see only two real possibilities. Either they were actually on the severed floor throughout that whole episode, which is wild to think about, but some have already theorized this. Or they created another field like the severed floor over the area of this national park. Those are the only two reasons I can think of as to why Helena would need the Glasgow Block. Unless anyone else has any other theories.