Answer:
[T]he light moved away from Lemon Brown, but not before Greg saw him hurl his body down the stairs at the men who had come to take his treasure.
Explanation:
The answer since Lemon was trying to hide away from the thugs who had came to take his treasure. It was later that, he whispered to Greg that they are bad men unlike the previous time when he was in good rapport with those men. For him to attack them first before the saw him shows that, the relationship between him and them has changed drastically.