That's a good question. It's just habit I guess. I've called baseball as well as softball the past 4 years. This year, I switched to using the "hammer" strike signal which is made in front of you to stop myself from doing that. Reasoning behind it is I have worked a lot of games solo this year and more than once i found my self missing action because i was so used to turning as I make my call. It's actually a really bad habit in my opinion (but hey, I'm umpiring high school ball and they're doing the college world series, so who am i to talk
)
-Josh