It was more than just a little luck.


And while I'm TIRADE-ing,
What about all the times it was an outright self-contradiction?

The tunnel between the Whomping Willow and the Shrieking Shack
was so small by Harry's seventh year that they all had to crawl.
Yet in their third year, Snape saw Lupin running through it.


And all that stuff about a wand being captured and therefore being owned by the winner...
That one made so little sense that you can't even argue with it.
Imagine if every time someone won a simple little exchange of curses...
Think back on all the times the Expeliarmus spell alone was used.
Imagine the wand, owned by "A" changing its allegance to "B."
And then the wand, still in the hand of its original owner ("A")
being transferred again when "B" loses a duel with to "C."
Multyply this by the number of wizards in the country and then to the power of ten or so.
It would be such a mess that no one could use wands any more.