Guild Wars - How to get any Green/Unique weapon easily 2017

Hello Everyone!
I got a really cool comment today. The guy said, that he killed bosses this
way: If there is any boss who has a cool weapon, what you want, just do
this:
-clear your way to the boss
-kill all the other enemies in the boss group, but be
careful, dont kill the boss whith heroes
-flag your heroes away(once their names turn grey its
enough)
-kill the boss and get your rewards
I think a basic Sos rit build is capable of killing 95% of the bosses. I did it
with my sin and derv, but you can do it with any professions.
I show you a few examples..

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