Some part of the problem statement you want help with (rather than a complete answer)?

One example would be looking up syntax and common functions. In a high-pressure situation it's much tougher to bumble around Google and Stack Overflow, so this would be a way for solving for "I totally know how to do this thing but it's just not coming to mind at this moment" which is fair. Usually we the interviews can obviously just tell them ourselves though, but that's what I was going for.

But yeah, the point is that once I applied it in practice it did quickly become confusing, so now I know from experience not to use it.

I think the other suggestions in this thread about how to use it are good ones, but they would present their own meta challenges for an interview too. Just about finding whatever balance works for you I guess.

Just another interview methodology pulled out of someone's ass. They don't know.