I mean, looking at the flow of the fight as a whole
”I must have dealt you countless fatal blows already!”
Franky says his weak spot is his stomach, tries to hit there, shouts “it’s over” but Sasaki dodges
”I’ll just put all my money on my strongest attack for a one-shot comeback!”
”I’m taking you down with me!”
Franky shouts “it’s time!” And then hits him in the weak spot he’d failed to hit previously.
Unless the translators have horribly screwed up- and I don’t remember these guys ever being especially inaccurate, they seem to get the gist at least- then Sasaki is beaten.