He wasn't 'supposed' to be anywhere, and only the fact that he wasn't terribly inclined to start something where people could see kept him from telling Ven as much. His face, however, was perfectly indicative of his growing displeasure at this particular line of conversation. The past should have stayed in the past, and yet here was someone doing all he could to drag the past once again into the light.

"He no longer exists."

It was truth in every sense of the word, and even if it wasn't an answer to Ven's question in the strictest sense, it did imply that he knew who Isa had been, at the very least.