A "Strike" with Consequences

"So something like this happened to you…" “Well!” I hurried her—and then the little thing shocked me into numbness:

"My… swimsuit bra got lost," she smiled so sweetly that I even lost the power of speech. What the hell did she lose?! I expected anything, but… How? How could you possibly lose the top part of a swimsuit while swimming?

"Are you kidding me?"

"Should I get up to show you?" And she really began to surface a little by little. My patience lasted exactly for a second.

No, this is definitely some ridiculous prank! Without turning to Masha, I clarified, like a clueless fool:

"So, right now your…" I didn’t finish—because I simply couldn’t believe it.

"Just… how? Explain it to me."

"I think I tied my bra badly, and it slipped off when I dove under water."