At the Migeod website you will now find much clearer and complete photos of Heinz' flugbuch (and wehrpass). It can now be seen that he flew on 14 May, two days following his shootdown.
You'll also find typed transcripts of the Flugbuch and parts of the Wehrpass (in German) which greatly clarify the handwritten notations and comments in the documents. You'll also find English translations of most of the Flugbuch notations.
Tinus (Biltongbru) has put in scores of hours to present these documents as a useful research source to the community.
With regard to the specific events of 12 May, Heinz is being asked for additional comments/details.
If you've not visited the Migeod Site lately, I encourage you to do so.
Heinz Migeod website.
You'll find that there are now more than fifty (50) Interview video clips, ranging in duration from 1 minute to 10 minutes. Heinz discusses the 12 May '40 shootdown in interview #1 and his final 11 Nov '42 shootdown and capture in Interview#48.
Much has been added to all the pages at the Site.