You wouldn't chase Singed..
So why are you still trying to chase Kalista?
I just saw a post complaining about how a low HP Kalista kited a Warwick to death. My question is, why was Warwick chasing Kalista in the first place? Go take a tower. Kalista wants to fight? Kill her. She just wants to kite you? Make her jump away (out of range) then go back to slaughtering her team, or her tower.
Kalista is an adc. If she's not doing damage, she's useless. If she's out of range, she's not doing damage. Taking her out of the fight is nearly as useful for your team as killing her, because your adc is doing damage while theirs isn't.
Kalista is certainly strong right now. She's a little more mobile than she should be, and her objective control is really strong, but she's also strong because people haven't understood how to play against her yet.
You have to treat Kalista like a full AP Singed. If she lets you hit her, pop her. If she's running away from you, for the love of Doran, don't chase her.
Edit on why I'm comparing Kali to Singed even though they have different roles.
I'm comparing Kalista to Singed because of the way we think about Singed. Everybody knows you shouldn't chase Singed. I'm suggesting that we also need to stop thinking about Kalista as if she's just like any other adc, and start thinking about her like, "I need to zone kali out of the fight, not kill her."