Unit 1 was traveling into the cove in which Unit 2 was docked.  

Unit 1 was traveling at a high rate of speed in the direction of Unit 2.  The operator of Unit 1 stopped accelerating and therefore had no control of his vessel.  

Unit 1 continued to drill causing it to strike Unit 2 resulting in scuffs to Unit 1's decal and sticker and scratches to Unit 2's surf gate.
Lake Hartwell