Hard to say.
There's generally TWO significant problems you can encounter with a THS (and no, very few centers would switch to a challenge pattern or much less an inverse block on a whim. That's a 0.3% probability):
1. Did they actually oil the lanes? Usually, not a problem. But, that hard of a turn seems to indicate they hadn't oiled in 3-4 days. I've encounter that at an AMF center just after Thanksgiving weekend. Or, sometimes, you can have a center that isn't open 7 days a week...if they oil...then people bowl on it all day, then they are shut down 2 days, and maybe they don't oil the morning they open...? Some centers only oil for leagues...if they don't have a league for 3-5 days, that might explain it as well.
2. One thing...less likely...is, IF they oiled that morning and didn't oil pre-league...which I've experienced a few times...those plastic house balls push the oil all around. Oil on the outside, no high concentration in the middle, a LOT of oil pushed into your break point? Yeah. Behaves the same way as an "inverse block". It's why 170-200 average bowlers show up to open bowling and struggle to beat 160 and maintain a consistent shot.
Those would be my best guesses.
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