catcher moves way over

[CecilOne]

I guess we are all together on that. What about the catcher who moves inside, blocking the slot? I've always thought (and been taught, I think) that we should stay down, try to use whatever slot is left and if none, shift outside so you can see.
I only mention it to the catcher if I realize that some inside pitches I can't see are thought to be strikes by the catcher and pitcher.