We know from social psychology research that a number of factors make it more likely that someone will intervene:
1. They notice the problem and label it as a problem along the continuum of sexual violence. They can see risk factors.
2. They feel responsibility for helping (they see a role to play, they don't blame the victim).
3. They weigh costs and benefits including their own safety. If benefits outweigh costs they are more likely to step in.
4. Do they have the skills to intervene?
5. Have they or others intervened in the past and with what effect?
What in the work you are doing addresses each of these steps in Latane and Darleys model of bystander intervention?