partner making call

[refjef40]

Varsity game runners on first and second my partner is out by third.The batter lays a perfect bunt spinning fair on the first base line.I jump out see her jump over the ball and beat the throw to first.everyone seems happy except my partner is yelling dead balland tells me the bunt grazed the back of the batters foot in fair territory and she is out.Of course the coach is livid wanting to know why I didn't see it.Would you guys have made that call?