Speaking of 'entertaining assassins'... There's a certain illusionist waiting for Yamamoto as he arrives in the city. For all that Mammon is an adult, their fashion sense of 'hood and facial markings' is still the same as ever.

...Also pretty short, but you know what, shut up.

The second he's close enough, they cut to the chase. "I've been using your identity to try and hammer at Squalo's brainwashing and make him trust me without compromising my own identity. I thought you should know."

They regret nothing, of course, but it's knowledge that should be spread around to relevant parties.