If you were not there and you use the words to the effect of "should have", you are an armchair critic. 4th class w/bad consequences is soloed all the time, often by people out on their own. Some forget the risk they are taking in this terrain, but it is often an acceptable risk to them, or so they think.
The key is to understand the consequences of your mistakes, both for your body and the many people that care about you.