If he tried to sense Virgil, he received nothing but the impression of an absence. A person shaped hole in the mindscape. So Yavin didn't try - he searched the girl's head instead as she struggled to explain their situation, failing to work backwards from the scene in which the three now found themselves. In Nemo's thoughts, the images were vivid and alive and made of stronger stuff than reality. Even so, he managed to patch together a jumbled idea of what had come before.
It required no great leap of imagination. A pub, the vampires, a Queen of Diamonds, the gaping maw of a dark skinned man. Fangs. His brow tensed, eyes flicking to Virgil's neck. Vampires.
"We messed up. They attacked him. Grabbed me..."
"I see." Yavin squeezed her shoulder but didn't let go, already charting a plan. "Alright, Nemo. We're going to, aha, to St. Mungo's now, I just want to make sure, Virgil here is, hm. Is alright. Don't worry," he added as he released Virgil to draw his wand for apparating, "I'll handle the questions. No need to get the, hah, the Ministry involved, right?"
That had already been something he sensed about her when they first met. It stood to reason, anyway, that if the pair had wanted two or four involved, actual red sparks would have gone off. Whatever this was, it was under the table.
Lucky for them, under the table was his job. Hooking an arm through Virgil's, still holding Nemo, Yavin gave his wand a flick and-- Pop! they were gone from the dimly lit streets of Camden Town. A fallen cigarette burnt itself to a fine ash on the pavement.