Facing someone who has caused deep harm, like a sexual harasser, can be incredibly challenging and triggering. How one might respond depends on their emotional state, the environment, and their personal journey of healing. Here are a few steps that could help:

1. Prioritize Your Safety: If you feel threatened, remove yourself from the situation immediately.

2. Stay Composed: Maintaining your calm and composure can prevent further escalation and give you control over the situation.

3. Set Boundaries: If it's appropriate and you're comfortable, you can assertively communicate that you do not wish to interact with them.

4. Seek Support: Reach out to trusted friends, family, or a counselor to process the experience.

5. Consider Legal Action: If you never sought justice and feel ready, you might explore legal avenues to hold them accountable.

Remember, your reaction is deeply personal and valid. It's okay to prioritize your well-being above all else.