And when it does attack, dramatic orchestrated music blares out as the Eye produces some unearthly noise. Just a brief, easily-missed mention of the gem being sentient in the rundown, that's all.
Especially nightmarish for those not familiar with the Thundercats series, as there's hardly any prior indication that the Eye of Thundera could do this. Not to mention it's shooting three other beams as well, meaning it's not able to control its own power. Then the Eye just up and attacks him of its own accord. He-Man breaks the Sword of Omens, then Lion-O, and walks off, content to allow Lion-O to live. The Eye of Thundera attacking He-Man fits here.
