Yet again, this one has me puzzled.

I can visualise why the front stagnation point occurs, but other than saying
to myself "because it has to be at the trailing edge", I'm not grasping why
the rear stagnation point happens.

Can anyone elaborate? Most of the texts I find in searching basically just
say that it happens, not why, or at least not in ways that are making sense
to me.

TIA