Need a little help on a mechanic - please

[Inthegame]

I was watching some fall college ball (Div. I) and I obseved this twice. Not sure if this is a new mechanic or what. One time I was in the stands on the first base side (game 1) and the other I was in right field well beyond the fence.

2 man mechanics - both times BU in "c" position - less than 2 outs.

Game 1 Sit. #1 close play at first base base - poor throw from left side of infield, low and wide towards right field - 1st baseman had to stretch for the ball. BU made no call and immediately went to PU for call for a pulled foot or not.

Game 2 (another day) Sit. #2 Again a poor throw from leftside of infield - this time chest high but towards homeplate. 1st baseman (person) swipes at runner (approx. 5' feet or closer to first base) as runner is heading towards first. Again no call from from BU but goes to PU to ask if a swipe tag was made.

I could be wrong or have "CRS" but I seemed to remember to be taught to make the call as you see it and then a) if a coach approaches go to partner for help or B) call time once play is dead and go to partner for help.

Please advise.

Thanks.