When Kiritsugu took the candle and lit it, Ivan was watching him, and once he has been told that he can get up he moves over to the candles, pulling one out and with some stretching up managing to light it... and then standing there, candle in hand and not tall enough to put it up where it belongs.

It seemed like a good idea to light a candle at that time. Turning his head, he looks into the direction into which the man who lit his candle earlier vanished into. His eyes shortly dart back to the mop of blond that indicates the only person in the house that he at least technically knows yet, but he's chatting with someone and children aren't allowed to interrupt adults. But that other man was alone. Maybe he hasn't gotten far yet...

Candle in hand, the little Russian ventures outside and upon spotting the gamekeeper walks towards him, his aim obvious.