Nessie, the celebrity of the hour, and Loch Ness' very own monster, responded to Silent Stab's emotional state.
Her will was bound to him, and was thus subject to his command. So, reflecting her master's anger and infuriation, she turned on Alex and Zooey, and began to go after them with hot determination. Silent Stab did not want them dead- at least not yet. He simply wanted enjoy watching them skip around hopelessly. For all the stress they had put him through, they deserved to entertain him before they died. It was the least they could do.
Alex found himself in a bit of a situation. He had managed to escape the frying pan, only to end up in the fire itself. He could not leave.
He did not even try to teleport out of there. It was of surety that Silent Stab must have already locked up the space around them. So, all he was left with was the option of running. With a forty foot long monster on his tail, he and Zooey had all the motivation they needed to flee.
