One threat at a time is generally the way to go about these sorts of things, yes.

[ Mildly, he sets the cup upon his knee, head cocking just so. ]

Though if what he says is true...the idea of him being able to pass one barrier is troubling enough. I shudder to think what would happen if he ever learned what you have.

[ That there are other worlds. Other realms he might seek to make his own. Such things the inhabitants of this world could only dream of. Certainly he'd need to be stopped before it ever came to that.

Preferably before this world suffered irreparable damage at his hands. ]

...how was it you came upon all this, then?