Dinah had learned not to underestimate her opponents, so she was ready for the hit. She wasn't able to avoid the head-butt entirely, but was able to move her head enough to lessen the impact.
"I'm not your sweetheart," Dinah snarled.
She hoped that he was telling the truth about working alone, but she doubted it. Why would a lone hacker feel the need to break into their systems? Unless he had his own agenda, which was unsettling to think about as well.
She grabbed his arm in a vice grip and yanked him away from his seat and the table.
"We should probably take this outside."
The other patrons in the coffee shop were starting to stare, and some might have even been standing up with the intention of trying to help. Dinah didn't want anyone getting hurt except the information thief.