I Hate Long-Winded, Pretentious Things

This was a conversation I had with Sebastian shortly before I departed for the Kingdom of Berlheim.

'You mean a way to distinguish doppelgängers?'

According to the report, Sebastian had severed the mana connecting the original and the doppelgänger by some sort of power.

'Yeah, I was wondering whether they had some special trait—something that could distinguish them.'

'Something special...'

Sebastian pondered my question, then opened his mouth a moment later.

'Hmm, they don't have many distinctive traits, but there is one peculiar thing.'

'Hm?'

'A doppelgänger's mana moves once every ten minutes or so.'

'Moves?'...