Hit By Pitch After Bouncing

[wobster]

OK, guys, here's a new one for me I am sure you guys are familiar with. I have looked in my OBR rule book and can't find any exception.

B1 down 0-2, pitcher throws wild, hits dirt then batter. I give first base because I cannot find any exception to HBP other than failure to avoid (I did not whip out my rule book on the field, I have looked before). I give first base, hilarity ensues.

Did I make the right call?