Thank you all for your further encouragement.
The black line with a blob [Solar Liquorice Lollipop?] is real enough.
At least in the usual, imaging sense. A short lived, dense filament perhaps?
I shall have to check the videos on my laptop around the time to check for duration.
Fortunately I often take many videos at very short intervals as I "snap" at moments of steadier seeing.
Putting date and time labels on my processed images is often useful to pinpoint such ephemeral features.
I can see the tiny white spots in all of these images.
Most likely EBs. [Ellerman Bombs] "Micro flares" according to Wiki.