Paradox of Time Travel in PoA

[Inge]

No: HPFGUIDX 132080

<smilingator81 at a quoted Hermione:

>>> "Nobody's supposed to change time!" <<<<

Inge:
So - it CAN be done - but not a wise thing to do (deliberately) 
because of the unknown consquences.

But what if you change time by accident? What if TT-Harry stumbled 
and broke both legs while hiding with Hermione and Buckbeak? 
TTHermione might still be able to get him back to the hospital-wing 
in time for them to get inside before Dumbledore locks the door - but 
how would they explain to Pomfrey (or anyone else) that Harry has now 
2 broken legs - when (in Pomfreys timelinething) only a minute 
earlier he was in bed with two fine legs?

What if TTHarry/Hermione had been attacked by something bad sneaking 
out from the Forbidden forest and they therefore didn't make it back 
to the hospital-wing in time? 

Hermione had been told that time is not supposed to be changed - but 
a lot of things could happen to the Time-travelers - no matter how 
careful they might be - which would cause time to change anyways.

Inge