I personally cannot call a travel just by the movements of the waist. I need to see the feet. I try to give some room between me and the ball carrier when he's in my primary so i can see his whole body.
As for calling in my partner's primary, if there's something obvious, or off-ball that he/she missed, then its got to be called. This is what my interpreter told us to do. The only exception to this would be the out of bounds call. I can't stand it when my partner calls the ball out on my line.
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