Great question! I had to stop and think about it, and when that wasn't good enough I picked up my guitar.
Don't get hung up b/c you are bending. Unless you are hammering off the bend (a thousand nuances here, too), I think you should end bent notes just like any other.
Do this: bend your string and keep it bent for this exercise. You are going to strike that note several times. Counting is not necessary but will keep you in Griff's good graces.
Anyway, play a series of quarter notes or whatever, but keep that string on pitch. Don't let it slip.
I think you'll find you treat the bent string just like any other .... ending with your pick before striking the next note (staccato) or letting it ring until striking the next (legato).
So the question becomes ... how does the bent note fit into your phrase? What are you doing with it and what comes next?
Disclaimer: this is just me and the way I do it. I do some things well, but I am no pro
Staccato or legato?
For me, legato pretty much means I end my notes either simply by striking the next note (if it's on the same string) or by muting as I release the fret. I don't end notes with my pick if I am playing a phrase legato Open fingering is trickier and has a different approach
Staccato, to me, means distinct ends for each note, and I think I always do this with my pick.
I do not use my palm to end notes unless at the end of a phrase. I do, however, use my palm in general to keep the lower register strings muted as needed.
And I never ever ever hold my pick such that my index finger and thumb get anyplace close to the strings. I used to do this and it was a hard and ugly habit for me to break. I pick with my pick, mute with my palm.
It's good to think about stuff like this.
Great question.