When one of his guards was killed, he accepted the Doctor's theory. The scientists about the Express discovered that it was targeting the weak, and the Doctor informed Quell that his mental issues made him the next target after Professor Moorhouse.
When the Foretold came for him, he fired upon it, claiming he would be a poor soldier not to do so, even though he was aware that the gesture would not harm the Foretold. Quell remained impressively calm as the Foretold approached, describing it and it's actions as clearly as he could in the time he had, up until his final second. As it moved to kill him, he thanked the Doctor for "waking him up" and considered his demise a good death as he would die facing the enemy, like a soldier. (TV: Mummy on the Orient Express)