Luna was absolutely shocked to see Tavin. Cylus was a surprise, but he was one of the men who was chasing behind Mina, Tavin on the other hand was a heart wrenching arrival. Luna was so obsessed with the man, that even though she knew he had moved on, it was hard to witness.
When the men were calm, it was Tavin who spoke. He first explained to President Lee how and why he had abused his credentials. Cylus added the next bit of information, leaving out the fact that he had contacts within the Anders corporation, and jumping straight to the fact that his business associate was hospitalized, and he wanted to make sure it would not affect his investment.
It was a cruel way to explain his relationship to Lisa, but President Lee had no idea of the past relationship, so to him it made sense.