I get why people are "angry" at that boy, but we must compare their situations, he CLEARLY had not much luck in live from what we saw of his past, he finds these jeweled eyes(by whatever means ever) and obviosly he would try to use them to get a better lot in live, he isnt "Tricking" anyone because he is evil, he tricks them to live, to have a better live. He should not trick the emperor, sure, but he has a direct and justifiable reason why he trys it.
now, come in the princess, and upon looking at each other (knowing nothing elsE) they share their memories, and all the boys sees is her DEAD BODY ON THE GROUND. and yet she is alive and seemingly well. Obviosly he would freak the fuck out and acuse her of bewitching everyone, considering she is, for all he sees, a walking talking corpse. His reaction, even with his intention of decieving the emperor in mind, are justified and reasonable.