Guild Wars 2

The bountiful theft trait for the thief: http://wiki.guildwars2.com/wiki/Bountiful_Theft
“Stealing grants you and all nearby allies vigor for 15 seconds. Up to two boons are also ripped from your target and granted to nearby allies. "
How does it work?

Let me give you two examples:

1. I use steal with bountiful theft on an opponent (either a player or monster, pvp/pve), said opponent only has 10 stacks of might with a remaining duration of 10 seconds – that is all the boon(s) he has.

Q1. What will I get from stealing him? Will I get 1 stack of might? Will I get 2 stacks of might? Or will I get 10 stacks of might? Also, what will the duration be on what I get?

2. I use steal with bountiful theft on an opponent (either a player or monster, pvp/pve), said opponent has 10 stacks of might AND swiftness with a remaining duration of 10 seconds on both- that is all the boon(s) he has.

Q2. What will I get from stealing him? Could I get 1 stack of might and swiftness? Could I get 2 stacks of might? Or could I get 10 stacks of might and swiftness? Also, what will the duration be on what I get?

Thank you very much

1 – might removed from enemy (all stacks) and you gain 1 stack. Duration preserved (10s.)
2 – both boons stolen, same deal as above.

Thanks.

1 more question. Is “Defiant,” which most bosses possess, counted as a boon? Can it be stolen with bountiful theft?

No Defiant is not counted as a boon and cant be stolen or removed, its stacks are only removed by using Hard CC, so a stun, daze, Knockback, knockdown things it counters removes a tick of Defiant.