Jacks neck

Can someone please explain to me why in the FST/purgatory world jacks neck would randomly bleed? It happened first in 'LAX' then again in another episode, and then in the finale. I may be missing something, but I would really like an explanation from someone who may understand the meaning behind it.

BTW...The ending was brilliant. What if our whole world is actually a purgatory type state in our subconcious.

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