I hope I'm not assuming too much but I'm really hope the up and coming hacker is smart enough to know that his work was worth more than $4,000. That's 1-2% of an annual SE salary for someone with similar skillset.
I agree $4,000 is way too low, but a $400k salary is really high, especially for security work.
So commensurate for approximately 2 days of work, a little high for two hours of work, and a little low for 8 days of work.