[hit a key] when spying.
I'm not sure if this is a feature or a bug.
When you spy on a node and that node comes to a [hit a key] prompt, it also requires that the spying node hit a key. This doesn't seem right, unless it's to allow the spying node to read what's on the page before continuing. I wouldn't expect that to be the correct behavior though. It could lead to accidental key input on the spied upon node.