What causes DS to analyze frames from 16 mins before the trigger event?

Sybertiger

Known around here
Jun 30, 2018
5,986
19,639
Orlando
See the timestamp plus the DS first analysis time of T-966350 msecs instead of T-0 seconds. The analysis is followed by T-69 msecs and in the T-69 frame you can see what the trigger event was. Also, what is causing the yellow "zone box" on the left side of both frames...or if it's not a zone box, what is it?

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