Everybody looked at each other in dismay.
Nobody else had noticed that when Ultron attacked with the Iron Legion robot.
Luke hadn't gone to the party, and only confirmed later that Tony had created Ultron by using Loki's scepter.
The other people at the party weren't capable of doing something like this, so they naturally weren't suspects.
It made sense that Luke wouldn't know that Dr. Helen Cho had been involved in this incident.
When Dr. Banner mentioned her at the moment, Luke recalled who she was.
As a top geneticist and nanotech expert in South Korea, she was one of the talents in Luke's database of candidates whom he wouldn't mind taking in if there was a chance.
Thus, he remembered this beautiful doctor.
Looking at her research project and results, he confirmed that this beautiful doctor was working on a research project called Regeneration Cradle.
