[Mp4-tech] a doubt about a statement in the spec

[Alan Yan, Ying Rui - SH]

Dear Experts,
I have a doubt about this statement in the spec. In 8.4.1.2.1, it said
that, 
The motion vector mvCol and the reference index refIdxCol are derived as
follows.
- If the macroblock mbAddrCol is coded in Intra macroblock prediction
mode or both prediction utilization flags,
predFlagL0Col and predFlagL1Col are equal to 0, both components of mvCol
are set equal to 0 and refIdxCol is set
equal to -1.
About the red highlighted words, is it possible that an MB which is not
coded in Intra macroblock have both prediction utilization flags equal
to 0?
I had thought that only Intra MB will have both prediction utilization
flags equal to 0.
Could you please help to give an example please?
Best Regards,
alan
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