[@MelonHead]

I was picturing it having been already most of the way over the mech's top by the time it extracted its head, having raised itself up beforehand to keep from being draped over the mech's back and to attack the lens (hence the line about it having lifted its tail above Higan's back). It's possible for the middle of the tail to get trapped, if Higan leans back some more. 

[img]https://c1.staticflickr.com/1/75/179347429_69ea773faa_z.jpg?zz=1[/img]
Like this, but with the tail fully out of the way and the ass hitting the wall (it has no pelvis, so its ass has ribs like a snake).