[rules-users] Why Using "from" Always Return A New Fact?

[hyjshanghai]

Thank you. I understand it now:
In the 2nd rule:
modify($p) => evaluate the 2nd rule again => re-iterate $p.address with
"from", so that Drools engine can know if there is any change in $p.address
compared with previous evaluation.

Also, the above modify($p) also triggers evaluation of the 1st rule.

Then, why "when the second rule fires, it deactivates the first rule." as
the document says?
I think nobody modifies $p.address.state. So the existing activation for the
1st rule should still hold. Why the 1st rule is not fired?
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