So I live a bit north but work in Austin about 8:30 this morning I can hear screaming outside my office. I exit the door to see what's going on and I see what appears to be a homeless guy walking through the lot screaming obscenities. This is not abnormal but still concerning, more concerning is there is a lady standing next to her car seemingly oblivious to this guy. At this point I go ahead and call 911 to report the suspicious behavior and keep and eye on the guy. This is where things escalate quickly as he sees her and she seems to be unaware or unconcerned by his behavior or demeanor. The guy has got to be high or seriously mentally challenged but as I'm on the phone with police he confronts her and then aggressively grabs her. I'm about 35 yards from what's going on but unarmed at my place of work and on the phone with 911 when she tries to break lose of his hold and get some distance, he then drops his pants completely. Jesus, this is with 10 seconds of their initial contact and I'm now faced with the fact that I now have to intervene. Luckily I'm not the only one who has heard or seen what's going on and as I start to run to that direction I can see 2 other guys to my left coming in as well. The guy sees us coming towards him and starts to run. The guy gets about 200 yards before we see Austin APD coming through the lot and apprehend the guy. The lady was ok but extremely shaken obviously. I have to give credit to the PD as they were lightning fast to get to us I'm not sure if there were other calls aside from mine but I was damn glad to see them. After I had some time to calm down and the adrenaline wore off I couldn't help but regret not acting sooner or how surprised I was that this happened in front of me so quickly. This was tough call for me for a few reasons, at first this was screaming, which escalated to assault and then what could have been a sexual assault at 8:30 in the morning. I have a personal belief that I don't get involved in others verbal disagreements or put myself in harm's way unless I have a firm understanding of the situation and in this case neither was the case when I made the 911 call. At the point that I saw things getting physical and the guy exposed himself I made a decision to get involved that said I had not given enough thought to "what" I would or was going to do when I got to them but as I said when I advanced he ran and I was unarmed so I'm thinking that was the best case scenario given the circumstances. Police took a statement and I was mortified when talking to the officer and he said they were considering what to charge him with and was told the exposure would be a misdemeanor and no more serious than a speeding ticket and would not rise to the level of a sexual assault because no "gratification" was achieved...WTF?? I have to believe there would be assault charges but not sure I'll hear back on that as the officer taking my statement said a detective may or may not contact me. I guess to me this was a damn fine response in terms of time for APD to respond but being unarmed dealing with somebody who was under the influence or having some severe mental problems left me feeling helpless to intervene effectively and efficiently until I believe I was morally left with no choice but to try and assist. That said I'm not sure how he would have reacted and if that had forced my hand to raise escalations had I been armed. Not sure what the question is or what I'm looking for but this was a bad situation that could have gotten far worse and one I'm not looking to repeat. A lot of respect for you guys in uniform who have to deal with this stuff on a daily basis I did not enjoy the interaction.