Luke Gardner indeed wasn't in a hurry to leave. Firstly, he was in a good mood today, and secondly, the Green Spirit Fruit came from Rafael Case, so he gave Rafael Case a face, a consolation; staying a bit longer wouldn't hurt.
When Edison Yates realized that Luke Gardner didn't seem intent on leaving, he also shut up and stopped talking.
However, what nobody expected was that Zayden Newton was taking too long. He spent the whole afternoon warming up the Pill Furnace.
At first, Luke Gardner was quite interested, but as it was getting dark, his expression darkened too.
Some elders had already left because they were not from the Alchemy College, so they couldn't possibly keep indulging a mere Heavenly Immortal here.
All the examiners, however, were still present.