Is Neil Green the mysterious man?

When Lisa came back to the hospital it was almost dark outside. She entered the ward and only found Linda Holmes peeling the oranges. There was no sign of Mark Holmes and Carl Black.

She asked her mother "Where is Dad?"

Linda Holmes glanced at her and said "Doctor asked to do some tests, so Mr. Black took him for the test."

Lisa was surprised to hear this. She was thinking, in the morning Dr. Valentine told that his father was fit for PCI, then suddenly what tests required. But she didn't say it loudly and only nodded in response.

Carl Black and Mark Holmes entered the ward after around one hour. Mark Holmes was sitting in a wheelchair and he was pushed in by a ward boy. When Lisa saw them, she hurriedly went towards them and helped her father to lay on the sickbed.

She turned around to face Carl Black and asked "Is everything OK?"

"Yes. There is nothing to worry about. All tests are normal."