Wilhelm Johnen's book - true or fake?

[Lagarto]

I just thumbed through the book but several things cought my interest. At one moment he says:
"The British machine was like a blazing torch but at the same moment Wegener received a burst of enemy fire from another direction. The bombers were obviously still in formation and protecting each other"
In formation? At night??

A few pages later, while he flies his Me 110, his radiooperator, "peering through his glasses at the night sky" (huh?), calls out a bomber "right ahead and level with us". It's beyond my imagination how a rear gunner in a Me 110 could spot an aircraft flying ahead of them... Or did they fly a Mosquito perhaps?