I'm not sure I agree. If you send your crew to go get the teams then all of a sudden, it's your fault that they didn't get on the field in time. The coach will be complaining that you didn't get them soon enough, etc. It's the coach's responsibility to get his team back on time.
Second, there is no manditory warm up. It's only manditory that you allow the three minutes for a warm up. If a team wants to have a huddle and discuss politics during the three minute time allowed, that is their business. Other teams will tell you that the hike from the dressing room to the field is their warm up. Maybe they did their warm up elsewhere.
After the half time is over, make sure three minutes are run off the clock for team's to use if they wish.
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