It all happened in an instant. Dahlia's nervousness disappeared almost instantly. Afterall, she had more important things to worry about. The world had rapidly changed around her and there was plenty to take in, but out of everything she was most focussed on the sensation of her mana draining out of her body.
It felt like the air was knocked out of her. After every few seconds she thought she was about to recover only to have a new surge of mana rush away and it felt like she'd been punched in the solar plexus all over again.
Unlike plenty of other things she had experienced, this didn't actually hurt. It was uncomfortable, sure, but more in a 'I can't breathe and it feels like my blood is getting sucked out' kinda way, rather than any actual pain. There was a constant underlying discomfort accompanied by surges of sudden dizziness and breath loss. It was quite jarring to say the least.
