When Bitcoin drops 10% in a day -
what happened next?

Tiered mode uses the previous close as the reference price. If the intraday low reaches -12%, all crossed tiers trigger, buying at each tier price. Default example: 3%/$100 + 5%/$200 + 8%/$400 + 12%/$800 = $1,500/day max - a 2x doubling ladder. Adjust freely.