Callisto nods; good enough. There are clearly a lot of ifs.

"You do it out of duty," she sums up in Greek. "Not enjoyment."

But there's another thing she want to make clear.

"You do not always have that. You do not have that--" The fist motion again. "-- on me."

He has no power over her, she means; he can't control her. And that's what she really cares most about, when it comes to discussions of power. Having it over others is something that she can take or leave: it's useful sometimes, but it's not worth actively striving for. Not letting others have it over her, however, is vitally important. Only her grief and anger are allowed that honor.