You have no idea if that's massive or not
it's a fictional power.
Maybe that's small ass bubble compared to what it would be with huge pain
Maybe size barely has anything to do with amount of pain
maybe that's just 1% of pain and 99% of exhaustion
What's factual is that Luffy barely took any damage whole arc:
^
This is what Zoro tanked and almost died from
I would also say nothing happened, because that would be embarrassing to admit