No Love Lost/Walkthrough
Anna's boyfriend will flee on a motorcycle; chase him on the PCJ-600 nearby and open fire. The game will instruct you in how to fire from a vehicle. Try to kill him before he meets up with his gang, to complete the mission early. If he does meet them, follow them off-road and take cover behind a tree. Use an Assault Rifle or SMG to take out all of the gang, preferably at range. Once they are eliminated, the mission is passed. This is an easy way to gain weapons, as the bikers drop them when they are killed, if you're fast enough to get them.