to somehow escape the burning weight (джен)

"And Thor screamed because he saw it happening, saw the way Thanos’s face subtely darkened and the muscles in his arm twitched as his fist tightened around Loki’s neck, ready to snap the life out of him once and for all.
Suddenly a blindingly bright light erupted around him."
Heimdall uses the last of this power to send Thor and Loki to safety instead of the Hulk.