That could still leave the guy behind the 'scope floating at 110v.
Not a situation I'd put a neophyte in.
The first rule of working on line-powered switchers, is to run it on a reliable isolation transformer.
As there might still be leakage, I use two robust 24v transformers, back to back.
I'm all for giving tricks to the newbies, but not if it might kill a stupid one.
And when it comes to strangers on a forum, ya just can't tell.
edit:
Oh, you might be right!
And that makes my point!