That startles Viktor properly, his eyebrows raising before he can try to school his expression. Stupid to be surprised, he guessed Singed must be involved in the creation of shimmer, given what he knew of the man and his visit down. He was fairly certain Rio was used in the creation of shimmer, but it was a fact not worth dwelling on for long. Of course he'd know Silco, who Vi did say was the one to spread it.

In truth he thinks he's more surprised Singed spoke of him at all. It makes him uneasy, as most things regarding Singed and their mixed relationship do.

"... he was my mentor for a time." A fact he refused to even mention to Jayce in the vaguest of passing. Colleagues. Impersonal. "I don't suppose you know what happened to him then. I saw him again recently, the eh... the new nickname is alarmingly fitting." A good question to buffer, because frankly he's a little surprised (and suspicious) of not getting a similar treatment Jinx offered at admitting his move to Piltover.