It's a fine achievement to get to the 1st XI in Year 8 - hell, even I didn't make it until Year 9. But so far in the competition, the player you're referring to has done very well, and taken ten wickets at a touch under 22 each. That's a great effort for a Year 8 kid, but does not fall within any known definition of "blitzing them."
Its all relative Snort .... taking wickets when needed ... getting that dominant batsman out at the right time when no one else could, even though he's hit you for some good runs. Stats don't tell the full story.
CAS ran a T20 Comp as well; some players who haven't performed so well in the regular comp excelled. The little leggie got some good wickets as well.