A factor:
Often times in held ball situations officials need to make their presence felt, with a loud whistle and physical presence, signaling to players to stop their battle. I find that when I'm in that mode I want to come in low (players often on the ground) with held ball signal.
It would be great to be able to just signal stoppage of the clock and then the held ball signal, but I don't know if that would be as effective in a floor scrum scenario -- just my take.
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