Sometimes we get lucky - this image was captured on the Middle Prong creek of the Great Smoky Mountains National Park, and a large clump of orange leaves went over the falls while the shutter was open causing the orange streak to appear. Meanwhile the falling leaves were collected on the moss covered rocks.
Panasonic Lumix G9
Leica DG 12-60 @30mm
ISO 400 F11 @1 Sec
*Effectively handheld thanks to dual OIS and breath control