Arcturus didn't mind the way that Imogen clung to him, if anything, he found it comforting. The rocks were easily avoided, as Arcturus had quick reflexes. Most were thrown in their path not at Imogen, however a couple smaller pebbles were thrown at them. This provoked something that could not be mistaken for anything besides an angry growl, as he deftly moved in the way of them, of shielded her with a hand.
The ritual temptations of gold and other riches were wholly ignored by the both of them, which was not at all surprising. He had realized they were supposed to be part of the test, but not that the test would be so insulting or infuriating to him. When someone took her by the arm though, Arcturus was done. His clawed fingers reached out and gripped the man's wrist hard enough that his claws sunk into flesh and blood dripped from the man's skin.
"You will unhand her or I will end you," Arcturus said, his second voice overlaying his normal speaking voice in harsh tones that ensured this was a promise not a threat.
The man swore and released Imogen in an attempt to pull his arm back, and when he released her, Acrturus moved his offending hand away but did not release him from his grip, and the more he yanked to get free, the deeper his claws cut. At this point he let go of his hold on Imogen, moving between them, and grabbed the man's other hand, by the thumb, twisting it backward hard until he heard the satisfying snap of the bone. "If you ever touch Imogen again you will not live to regret it." He moved then, quick as though, and hit the man square in the chest with the open palm of his free hand and at the same time released his grip on his wrist. The man fell back and landed on his ass, gasping for breath.