Originally Posted by Princess_Allez

it's strange that no sealant came out. It seemed to be a sudden loss in pressure; maybe that's why no sealant came out. The only scenario I can imagine, where that would happen is a sudden loss in pressure causing the bead to unseat just enough to lose the majority of pressure, but then why no sealant at the rim ...maybe the sprint caused the bead to unseat and that tiny slash is coincidental to the situation. Either way, I just tossed the tire and replaced it. I got them while they were 50-60% off, so no big loss.

I haven't tried the all-mighty gp5k or Vittorias yet because I'm afraid of this exact same situation happening, and instead of replacing a $25-35 tire I'm now replacing a $45-55 tire.