The 3 dots were from the assasins crew ability "Deadly". Which gives you an option of Hunt, Prowl, or Skirmish as a free action dot. This bypasses the rule that starting characters only have 2 dots in any one action. So a number of the crew put this action dot into an ability they already had at 2.
At least that was my impression, but now thinking about it the Spider has 3 in Consort.... so I"m not 100% anymore. Maybe @OneSevenDesign can clear that up.
XP triggers in Blades can be either quite loose, or quite stringent, depending on the group. Most I've seen go fairly loose, so if for instance the player "addresses a tough challenge by " is remotely addressed (or attempted) they could probably get 1 xp from that line. Did they mention something about their past?, go to a contact they'd known in their previous life? Explain why Akorosi people are weird to them? Boom, Background or Heritage Xp tick. Similarly, beliefs/drives are just things that the character wants to see done in play. If that happens, or is attempted. Generally some XP can be given there.
The Vice and Trauma stuff can be a bit tricky to get a handle on, especially in the beginning when they don't have trauma yet.
Hope you are enjoying the Blades group you've got going in any case, I know I've been enjoying playing in a game of it as well- and I'm thoroughly intrigued in watching more of this show in the future!