Peri Brown's conflict between duty to the Doctor and her own ethical boundaries when confronting his recklessness

Peri intervenes to stop Lang from attempting to murder the Doctor, stripping him of the gun and reviving his weakened body. She then pivots to pleading with the Doctor to …

Peri grows alarmed when the Doctor reveals his plan to send her back ten seconds through the revitalising modulator—to safety in the TARDIS—yet his reliance on mechanical timing immediately undermines …