There is always a million "What ifs" that could pop into your head. It isn't your fault. That kid made a choice to do the wheelie, even if Anthony asked him to its possibly someone else could have asked him to. Don't beat yourself up with guilt, it isn't your fault....
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"Though we're strangers till now
We're choosing the path between the stars
I'll leave my love between the stars"
-'As the World Falls Down' Labyrinth