I'm just a little uncomfortable about being on a rickety bridge<, over> a boiling lake of lava.

park sang joon

Senior Member
Korean
Now Shrek and Donkey have to cross over a bridge above a boiling lake of lava.
Shrek: You can't tell me you're afraid of heights.
Donkey: No. I'm just a little uncomfortable about being on a rickety bridge, over a boiling lake of lava.
<From the movie "Shrek">
I think "over" phrase modifies "bridge" immediately preceding.
If so, I'd like to know what role the comma before "over" plays.
Thank you in advance for your help.
 
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