The blank eyes suggest she's the woman who met Julian, and she identified herself as Kanti.
That makes sense to me. So it's Kanti, but she may not be operating under her own power. That implies there's another player in the background we haven't seen yet, I think.
My first thought was that the bam came from Julian's gun, but - yeah - perhaps Kanti was here both to support Vik at this difficult time and to put him out of his, erm, misery. I suppose it fits the pop-up text.
The 'BAM' is written in the same shade of pink as the various cloud tentacles used by Cherry and Zenon. That makes me suspect it's from an action taken by whoever is backing Kanti, but I don't know for sure.