Question

Hello and blessings,
Question:
A. It’s not entirely clear to me how stories are scattered throughout the Talmud about our sages that if someone did something wrong or said something wrong, they burned him with the gaze of their eyes [Rabbi Shimon bar Yochai, Rabbi Yohanan, and others]. A. Did they not care about killing people? B. Is there a prohibition against killing a person by means of a gaze?
B. It is explained in the Talmud in Sanhedrin that an apikoros is someone who disparages Torah scholars. Is he an apikoros in the sense that they kill him, or only in the sense that he has no share in the World to Come?
Best regards,
A.Y.A.