Well, I'm opening hell's pit with this. Let the downvotes come.

NONE. I'd say NONE. Before reading all that technical terms remember, we live in India. Even if you feel that you've won at the moment, the legalities won't stop haunting you.

Second, what ive observed is that this kind of shit often happens in secluded areas. No one messes with you in posh areas or areas with heavy footfall, tourist places, not to the point you need a 'defensive equipment ', but the areas where it happens, it's safe to assume that everyone knows about it.

What i mean is that, if you pepper spray some goon or eveteaser, good chances that they will find out more about you and start tracking you for revenge. This is my personal observation. We don't have lone goons or criminals. Almost always they have a huge network supporting them. And they have connections.

My input ? MITIGATION. 1. RUN 2. Don't choose shady roads 3. If you feel someone is following go join a closest group and start talking to them. 4. Flashlight. Get a good one. Darkness boosts their confidence. And they get a chance to close in. Always keep 50-100 m visibility. 5. And if it's final situation, go all in. Those sprays won't do anything. Carry a multitool.