You have a point here: (13) Zarqawi tried to move off the stretcher where he had been placed by Iraqi police. could work, but it was the writer's choice to place both the events of being placed on the stretcher trying to move off the stretcher before the event of securing him back on the stretcher and in past perfect. It's a matter of writer's choice, how much he/she places in one tense or another, while trying to instill in the reader a feeling for the time sequence.
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Rotter 1. First I went to the gym and trained for 90 minutes.
2. Afterwards, I went to a shop and bought two trousers which is
suitable to wear in summer. They were very cheap. That is why I bought
two of them.
3.I went to the gym for training this morning and bought two pairs of
trousers on my way back home. As I didn't have any