Alexander didn't hear an answer from Rose so he believed she wasn't there and this was only a trick for Zayne's enjoyment. Zayne couldn't be so twisted to bring Rose here to see Mathias being tortured. Rose should never see something so cruel.
Alexander looked up to see if Rose was there and surprisingly, he saw her back as she walked away with one of Zayne's soldiers.
"Rose!" Alexander yelled, starting to move after her but he had to stop otherwise he would be leaving Mathias in Zayne's hands.
Alexander glared at Zayne for going so low to prove a point. "You judge me yet you brought Rose here to see this. For what? Just so you could prove a point?"
"Yes,' Zayne replied.
Truthfully, Rose didn't see how Mathias was tortured and Liam had covered her ears, only bringing her forward when Zayne called for her but Alexander did not need to know this.
Not yet at least.