Frame 536:
Call 11388044, this is before a large area is turned to alpha.
Call 11388086 is after.
Call 11388194 by this call, an even larger area has turned to black.

Between call 11388122 and call 11388194, a large black area occurs, so something
in there must do it. Looks to be textures that are being created or something..

Call 11385648 is before parts of the plant change,
Call 11385662 is after it starts getting a bit darker.
Call 11385698 it has become fully dark.