More than likely he had it red lined in 1st, finally figured out how to shift it, then put it in high gear and killed it. Then forgot to push the clutch in to restart it. If stealing something starts feeling like work, most thieves give up and move on to easier targets.
My daughter's drove a stick and it took a little while to get comfortable. It's a great thing to give a kid as their first car. They can't text, phone, eat, etc. while driving and they'll never forget it. The 6 speed manual has taken me a little while to get used to operating. I grew up on a 4 speed and I've shifted from 2nd to 5th, or 6th to 3rd several times on accident due to the narrower spacing.