Don't do it
Well, this is gonna turn out bad.
You stand up, and look at the old man. He is sincere and only wants to help, but he is in your way, so you kick him in the kneecaps and break his legs. he falls to the ground screaming in agony, so you punch him in the face until he shuts up. When he is dealt with, you leave the building and look for the guy who injured you. There he is, across the road.
Limping, you cross the road and chase after the guy. the guy doesn't know you are following him so you have the element of surprise.
You stand up, and look at the old man. He is sincere and only wants to help, but he is in your way, so you kick him in the kneecaps and break his legs. he falls to the ground screaming in agony, so you punch him in the face until he shuts up. When he is dealt with, you leave the building and look for the guy who injured you. There he is, across the road.
Limping, you cross the road and chase after the guy. the guy doesn't know you are following him so you have the element of surprise.