Let’s get some familiar Aussie critters to demonstrate this. 

Andrew and Bruce are pulling Carl, who is sitting on an Australian toboggan called a “Wallabillumjumbaooladooker”. Not really. I made that up. There is no such thing as an Australian toboggan. 

Anyway, Andrew and Bruce are pulling Carl. Andrew is pulling in one direction, Bruce is pulling in a different direction. The result is that Carl moves in a third direction.