Mystery

I have just spent (wasted) a lot of time being nosy. Horse type large van parked opposite us and two men took for ever unloading bags, boxes, clothes. A young lady turned up and watched as, after a long time, yellow motorbike came out followed by the red one. The yellow one was returned to back of van and red one pushed to, I couldn’t see where due to our bushes. They are not road bikes and I am wondering if it is a stunt machine with this young lady participating.