Rosita is an Assault hero, with the following Leader trait:

Deadly Tactics

Rosita's attacks which have only one target deal +X% total damage. If her attack has more than one target, she may move for half an action point after attacking.

As a leader, each member of your team gains this bonus.

Note: When Rosita is paired with other traits that grant half-action move points, each trait can activate depending on the situation of the survivors. For example:
• Alpha: Get half-action move point from body shots
• Tactical: Get half-action move point if you didn’t move before attack
• Rosita: Get half-action move point if you hit more than 1 target