I have always been a big fan of punctuation to add coherence to a paragraph. Plus, I don't think that the scenarios you outlined are likely but i never cease to amaze myself with how wrong i can be every now and then.

My Monday share purchase in the low 70's was sheer serendipity. I have heard nothing about RVX that woud cause the price to jump 20% or the Level 2 bids to balloon but there must be some reason for these events. Did someone at Pfizer return a phone call and provide a little verbal comfort? Beats me!