One way of preventing Dumbledore from using a time-turner is to have the disturbance take place at Azkaban. And after Bellatrix’s breakout, it shouldn’t be difficult to have him consider another potential Death Eater escape as a matter of absolute emergency requiring his personal intervention.
Of course, Azkaban is the one place Quirrell can’t act in directly, so he’d probably want to Imperius an off-duty Auror or something.
In the Azkaban arc, they were able to Time Turn away from Azkaban, do some preparation, then arrive after being informed of the breakout. I don’t think this would work to prevent Dumbledore from using a Time Turner to be in two places at once.
One way of preventing Dumbledore from using a time-turner is to have the disturbance take place at Azkaban. And after Bellatrix’s breakout, it shouldn’t be difficult to have him consider another potential Death Eater escape as a matter of absolute emergency requiring his personal intervention.
Of course, Azkaban is the one place Quirrell can’t act in directly, so he’d probably want to Imperius an off-duty Auror or something.
In the Azkaban arc, they were able to Time Turn away from Azkaban, do some preparation, then arrive after being informed of the breakout. I don’t think this would work to prevent Dumbledore from using a Time Turner to be in two places at once.