Here I am again. You should have the file (thank you, again) and during this time I worked on the clip, doing various tests.. This is what I came up with now.
I think it's a much better result, but there is quite the room for improvement since you can't actually "understand" from where the flash actually comes..
Aside from that, even other hints are deeply appreciated, thanks to everyone.
Flashbulb test V2
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