What do you think it could be?

I agree that Shakti's behavior was very strange at that moment. To go as a Warlord deep into the swamp, deliberately moving towards a can, which turned out to be a level 2 creature, while Shakti's army only allowed him to take a level 2 creature at most. But you could have asked your opponent first; maybe he would have explained why he went there. If he hadn't given you a satisfactory answer, I still don't think it was worth posting about it on the forum. As Dreamcatcher says, there are moments in the game that don't make any sense and are done randomly, which makes some people suspicious. But if this had happened to you with that person again, then you could have posted a similar topic on the forum!