Patia Dispel

BRENNAN: First to act is going to be Patia. The door has exploded off. You've walked into Magister Cormorant's office. There are tables, fireplaces. You see some teleportation daises here for porting around the city. There's some papers. There's a chest in the corner. Other documents are around. But you are first to act as Laerryn says, "Show yourself." Nothing has happened yet, but you feel a crackling of arcane energy and Laerryn's certainty that there is someone in this chamber.
MARISHA (PATIA): Do I sense a spell being cast?
BRENNAN: Yeah. What you can sense is you feel the familiar rush of arcane energy. You feel a surge of something moving in the direction of conflict.
MARISHA: Moving in the direction of conflict.
BRENNAN: But you have the jump on whoever's in here. A construct smashing a door across a room will certainly make whatever force is in here, but you cannot see anything at present.
MARISHA (PATIA): Okay. Let me look at something... This one's a little- I'm going to let DM rule here.
BRENNAN: Yeah, go for it.
MARISHA (PATIA): Is this a situation where a Counterspell would count?
BRENNAN: The ruling, I believe, on Counterspell 'You attempt to interrupt a creature in the process of casting a spell...' Do you need to be able to see it? 'You attempt to interrupt a creature...' I don't think you need to be able to see it.
MARISHA (PATIA): That's why DM ruling here.
BRENNAN: I am going to double check that because that's very important.
[...]
BRENNAN: Sorry, I have such bad news, and it's coming on behalf of Jeremy Crawford, who lets us know that-
AABRIA: Goddamn it.
BRENNAN: Counterspell requires you to see the spellcaster you're countering.
MARISHA (PAtia0: Okay. Copy that. Instead-
TRAVIS: Thanks, Jeremy.
BRENNAN: Thank you, Jeremy.
SAM: Germany is watching us?
BRENNAN: I thought I remembered it. It's not in the script. It's in the portion of the Player's Handbook on Twitter. It's not in the PHB, but yes.
MARISHA (PATIA): Okay, how about this instead? Wait, wait, sorry. Okay, okay. If I can feel the direction that it's coming from, I'm assuming he must be invisible or something like that. This just says, 'Choose one creature, object, or magical effect within range.' Can I Dispel Magic and try and blast him with Dispel?
LOU: What does Germany think of that?
AABRIA: I love wizards being like, I don't like your magic. I would like it to stop.
MARISHA: Yeah.
BRENNAN: Unfortunately, no, choose one creature object or magical effect within range. So, because you cannot detect it. MARISHA: Okay.

Episode 2 - Bitterness and Dread - 3:11:30