But it looks like he's forwarding the zaps to you, right?
Discussion
Am I missing something? This is the zap address on his profile
I noticed an option to split zaps the last time I renoted someone. It let me pick what % I take vs the OP and defaults to 90% for OP. It looks like he is doing the same thing here: 
I believe that’s specific to Amethyst only. Other clients don’t do this but it would be nice if they did.