It's Rikku's words that make Jack do a full-on double-take, before he settles on staring at her over Kalki. "You-" Jack's discretion in not mentioning Kalki or not talking with the Heroes about his thoughts in public was mostly for Rikku and Yuna's sake. But, of all the Heroes who had the right to decide whether Kalki lived or died, Jack had said before that it came down to those two, and expected that Rikku would be the first to put a knife in the woman's back.
She's a better person than Jack is.
This leaves Jack completely unprepared for Kalki's attack. He puts a hand to his chest and drops to a knee, weakened suddenly. Focus on Kalki, because she is your opponent. "Another half-measure. You don't want to kill us any more than we want to kill you. But we can't join you, I can't do it."
This could be dangerous, if it manages to get redirected, but Jack hasn't seen anyone dodge this spell before, so he casts Drain. It's another half-measure on his part, too. Literally, because he only casts it the once, in case it goes wrong.
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She's a better person than Jack is.
This leaves Jack completely unprepared for Kalki's attack. He puts a hand to his chest and drops to a knee, weakened suddenly. Focus on Kalki, because she is your opponent. "Another half-measure. You don't want to kill us any more than we want to kill you. But we can't join you, I can't do it."
This could be dangerous, if it manages to get redirected, but Jack hasn't seen anyone dodge this spell before, so he casts Drain. It's another half-measure on his part, too. Literally, because he only casts it the once, in case it goes wrong.