At the end of Mr Robot Season 4 Episode 4, its pretty much given that Tyrell Wellick goes off into the woods to die. He's been shot and tells the others to go on without him. However at the very end of the episode, we see him one last time wandering in the woods, following the sound of a howling animal which they've been hearing the entire episode. He finally finds it, however all we see is that he's come upon some sort of mysterious blue light, which he stares into as the screen goes white and the episode ends. We never see him again after this other than in Elliot's dreams.
What was the blue light? What did he find?