The reason for him not using it yet was because Simon knew how dangerous the trail ground was and he wasn't sure that he would be able to clear it by himself. However, now that he was pushed to the edge, it would be foolish not to use it.
Other than the return transit rock, his eyes also went towards the golden guardian stones and the Philosopher's stone. Irene had stored a powerful magic inside the philosopher's stone. Simon had no doubt that he would be able to change the situation if he used them and using the return transit rock, he would be able to escape this predicament.
Simon glared at the two old men with his crimson eyes, just as he was about to use the items, a familiar voice rang inside his head unexpectedly.
Vouves had a bad premonition seeing the demon noble glare at them so defiantly even at this point. And so he pressed Davis beside him to stop playing and knock the demon out. Holy magic was the best magic to use against a Demon noble after all.