In Saints Row 2, the data files for this activity are included with the game. The data files for this activity were incomplete, so the details of this activity are uncertain, but it seems that this activity involved protecting people, in an escort type mission, rather than killing them.
The activity consists of 2 parts. In one part The Protagonist is flown around by helicopter and has to use an Annihilator to keep the gangs from taking out the Saint driving around in their car to get to a specific place. The other part is where the Saint The Protagonist's helping is not in a car. The Protagonist ties himself to a helicopter and goes a little down the side of building to get a good view to snipe. The enemy gang comes riding and running to stop the Saint while The Protagonist has to take them out with a sniper rifle.
When played as part of the storyline, there is an opening cutscene.
Pierce: "Check it out, boss..." The Protagonist: "What's up?" Pierce: "Since this used to be a Syndicate crib, thought I'd poke around and see what they left behind." The Protagonist: "So what am I looking at?" Pierce: "Safety deposit keys. Now, don't you wanna know what it is they got all locked up...?" The Protagonist: "The Syndicate will know we have the keys -- they'll be waiting for us to make a move." Pierce: "I guess you better watch my back." The Protagonist: "Let's go."