Ah... closures! So that's what's happenning.

I did a research on Google and came up with a few interesting links on variable scoping inside closures. I will list them here for reference in case other monks might find them interesting.

1. Perl 6 mailing list message 5617;
2. Understanding closures - the easy way;

Thanks diotalevi and pg. And ++ for the explanation. Much appreciated.