I realize that it's way, way late in the game to be asking this, but...
I was under the impression that ladies couldn't just "bust" like that. Like, this stuff takes time and if you're that close to it without Satou triggering it, then you were close to begin with.
I think a reversed order here flows better, it also gives slightly more room between 'started' and 'startled' so it feels a little less repetitive - imo. Then for the final bubble, maybe:
"Wait, did she break it off already? That was too quick!"
Switching language to "break it off" I think feels slightly more natural in this context, open to disagreement though. You could also do something more like:
"wait? Was that it? Did she break off already? That was too quick!"