Another cyclist down. Mirrors?

[Swoop]

But if they're on a motorbike and get rear-ended then that's completely different.

In a considerable amount of times, you have the option of "gtfo" of there by using your engine.
Lycra-clad tosspots will just wobble their arses around, then die.

[caspernz]

In a considerable amount of times, you have the option of "gtfo" of there by using your engine.
Lycra-clad tosspots will just wobble their arses around, then die.

The only assumption you've made in this is situational awareness. The cyclist in the OPs post seemed to be lacking in this regard, so with or without engine, end result might well have been similar...