My first thought was that the pit was consciously there to echo Batman Begins when young Bruce fell down into another pit. Only this time he didn't have his father to pick him up. He had to do that himself. I think that's a reflection of (as the film flashes back to) his father's words 'Why do we fall?', well 'so we can pick ourselves back up'.
In this case after being physically literally broken. Although yeah, I find his recovery a tad fast. At least that's my initial take on it's presence. Another callback to the circle of the story.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist