In Journey to the centre of the Tardis, we discover that the monsters roaming the Tardis are the characters who will later burn in the Eye of Harmony's chamber and leak back to the past.
The effects of staying in this chamber, according to the Doctor are
our cells will liquify and our skin will burn
Supposing that this doesn't kill you (somehow), do we know why are the burnt versions of the characters hostile? Why would they want to attack their past/original selves?
One could theorize that they're mindless zombies since their brain cells have liquified. But I'm skeptical about that, because they seem smart enough to chase everyone - specially given that some reached the Eye of Harmony before the Doctor did (there were zombies on the other side of the bridge) - almost suggesting they knew that was their destination.
So they seem smart - but smart people don't kill themselves (right?).
So is their hostility actually explained in the episode?