Community AdminMarvins are the poor neutral AI bots that you see in some missions.
@michael52047 If you're rodeoing, make sure the shield is down and that the reticle flashes when you hit the titan's vulnerable spot. Atlases are the easist to hit while rodeoing.
Alternately, from the ground hit an unshielded titan in the red glowing spot to get points towards the challenge.
Another tip:
Replay the Campaign mission on Airbase. Sprint through the hangar (or main warehouse facility in the centre of the map) or go down one of the sides and enter through a hatch (window) onto the upper platforms inside the hangar. At the end of each side at the beginning of the match, there are two AI Titans which are preoccupied engaging the enemy teams AI Titans. Use this opportunity to get behind them and score several Critial Hits on Titans.
Community AdminAirbase is generally great for Charge Rifle abuse, even discounting the AI titans.
