Don't beat yourself up, kiddo, you did just fine.

It's such an imprecise sort of thing. I don't think any of us took it all that literally; it's just a bit disturbing to be confronted with someone seeing visions of - well, our friends or loved ones lying dead.

I plan to avoid all Dementors, swarming or otherwise. The only one here at Grimmauld usually announces his approach with muttering so he ought to be easy to keep at bay.