That's not how advantage works.

During my last R20 D&D campaign, the DM gave me a bunch of spell effect tokens so my wizard could accurately mark where spells hit. During other players turns, I'd have lil conversations between the wizard and his spells in chat. It was good silly fun, thanks to Roll20's bizarre design choices.

I've never seen someone else play D&D without being absolutely baffled at what kind of rules they use. Come to think of it, it's not that rare to play a game like Settlers of Catan or even Uno with new people and also find that they have been following completely made up rules without realizing it.

Poor Sildar...