Who, when being worked 12x7, and when given the pressure of being a blocker of everybody else, isn't going to respond poorly? I've seen some of the nicest and even tempered people get short with others when the pressure cooker is really turned up. Rick sounds like he was a good guy to begin with - someone who regularly helped his coworkers, someone his coworkers trusted - until he was overloaded with work.
Fight or flight. When exposed to extreme stressers, people tend to take one of those two paths. Rick took the first. Someone else would have broken down balling, or spiraled into deep depression, or isolated themselves. Don't blame them for being human - blame the company for creating such a terrible environment.