In aikido class, I was doing a simple little throw I've done a million times for the last 20 years, it wasn't working and I was getting annoyed. "What's going on here?" I heard my inner self ask impatiently. My aikido partner-an energetic teenager- summed up the situation well. Sometimes aikido class is like building a sand castle, it's beautiful but dissolves with the incoming waves. Like real life.
I figured out the problem as I pedaled home on my bike. Attacker does A and I respond with B , followed by C. Because the uke (attacker) didn't do B the way I expected, it disturbed my response and I got stuck. It was expectation versus the reality of the situation. Like real life. Wait a minute! that sounds like a realization. It was a reminder that training in the dojo is all very nice but it has to apply to the real world or it's worthless.
Don't rely on expectations, they can go awry and when they do, you have to stay centered instead of getting frustrated that things didn't work as you planned. Like real life.