I fully support short posts when warranted, and with one of my partners I've contacted them through skype to work out scenes that require short posts. Your last post is about 2-3x as long as my bare minimum I ask for out of my partners, and very good by the way, which is why I told you at the beginning that I do not require my partners to match me paragraph for paragraph. I ask them to do what feels right, as long as I have 6 or more sentences to work with so I myself can reply with more than a few lines. Descriptions of surrounding, body movement, facial expressions, internal thought. All of these, put into a post, make even a single line delivered by a single character take up more than enough space to keep me from headdesking, y'know? (Sorry for preaching, it's a habit of mind, though I'm sure you've noticed :P) I've written short posts too, here and there, when scenes like this come up. I can even link you directly to some if you don't believe me :P
In other words, I agree, sometimes short posts are what is needed :P However I don't let that diminish my love for long integral posts :P *Teases you*