Yes, your patronus was indeed strong enough to force the creature back into the darkness. Although confused by the man's actions, a feeling of confidence and happiness grows within you; a result of your conjured patronus.

"What... Happened?" The man mumbles as you move towards him. A look of fear, covered by confusion.

Maybe your questions overwhelm him, maybe the attack and the terror is still too strong. Whatever it is, he doesn't answer your questions. Not all of them, at least...

"It's YOU." He cries out. "You're the one making the creatures. They're coming from you." The man raises his arm towards you and points a shaky finger at your wand. "How do you do that? What are you?"

The patronus might have fought off the creature but the man is still in a state of panic. Sending off more patronuses didn't seem to calm him in the slightest.

He still needs your help, but what else can you do?!