Dead ball/Look back

[fredhjr]

Although I did not see the following situation I was asked about it. Batter was hit by a pitch, went to first base, stepped off the base and was called out per the Look Back Rule. I asked if the umpire had called or signalled to play. This was unknown. I explained that if the ball was still dead, then no out. If, however, the umpire had already signalled or told the pitcher to pitch, there was an out. Just looking for some reinforcement here. BTW, there is no heated argument going on. Just discussion of situations and what was, could have, should have been done. What say ya'll?