Halftime adjustments?

[bellnier]

Just curious is all...

I was watching a BV Sectional game last night and there was little flow, in either direction, in the first half...foul and violation calls on nearly every trip. The second half was like an entirely different game with significantly fewer whistles. I could see how both teams made adjustments, but it was pretty apparent that the officials made some adjustments as well. How does this work? I officiate a sport where there is only one ref, so I never get the opportunity to get input from a second official at halftime. Thanks.