I think the key word is "If".....when I think of a dead ball, I think of all play stopping immediately and that is not necessarily the case with obstruction. I think interference is a dead ball and play stops immediately.
Delayed dead ball means that there was a rule violation where an award or judgment will be made at the end of the play. That is, the ball will become dead once the play is over, not immediately when the violation occurs.
Note that the same signal is used for an illegal pitch, where the ball may still be batted into play, but there may be penalties to access once the play is over.
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