So... Where is he? - BRONZE
I agree with Kenneth's questions that probably should be asked. If they really did play game one, then this isn't an issue with Tardiness, but Nikolai is slowing the match by leaving without notifying a judge and thereby also taking an unreasonable time between games of the match. (If Anton was able to make his sideboarding decisions, shuffle up his deck and “present” it to the opponent that isn't present, then Nikolai should be similarly ready for game two.
It's not mentioned in the scenario what round we're in - if this is round one (or another early round), it's more likely that Nikolai just didn't know what was/wasn't acceptable and a Warning for Slow Play covers it. If this is a later round, another investigative line might be if to see if this happened in any earlier rounds. We could just ask Nikolai if he has left the table between games in previous matches, or if we strongly suspect foul play, we could check with other judges or Nikolai's previous opponents. That's a pretty serious line to take, though, so I'd have to be pretty confident this wasn't just an honest mistake to start down that road.
The questions about the current match seem fine, though. We have to wait for Nikolai to return, anyway, so we may as well chat with Anton.