:) Yes, I thought that point in time is perfect for Lehndorff to actually go travelling, have some adventures and choose to come back. (The alternative is after his first wife and children are all dead, when he did in fact travel, but that's just too sad, and I wanted him to enjoy himself.)

Visuals: and here is the Twelfth Doctor playing electric guitar for you.

And hey, it's not a proper timeline if someone doesn't suggest Fritz and MT should marry. :)