Out of Batters Box

[CD_Ump]

I'm looking for opinions here. Mod Men's Fast Pitch, no batters box drawn. Bottom 7, 2 on (1st & 2nd), Home down by run, 0 or 1 out. Batter squares to bunt and clearly steps directly BEHIND home plate, and out of what would have been bb. Batter would have been out on sac, but would have moved runners to 2nd & 3rd. Next batter singled, and game would have been tied at least. I have taken a TON of poo for making the call ... should NOT have "seen" it and "no one would have noticed." Told I "effected the outcome" by enforcing this rule. Opinions, pov's please! Need some input here.