My wife is smart and has experience working around animals. We raise reindeer and have a bull - keeping a close eye on his behavior is a safety precaution all year long.
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The moose went back into the woods each time before she go out and attempted to get the bike home. This fiasco lasted almost an hour.
She has been around moose for decades and is knowledgeable about their normal behavior.
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this bulls behavior was way out of the norm for this time of year. Cows with new born calves - well one can expect to get charged if you get too close.
Observations or experience from others as to the why is the reason for the post.

Now if it had happened to me....I'd still be riding up and down the road trying to figure out how many times the moose would charge