Have you ever attempted to shut your eyes and open them back up when twenty minutes has roled around? If you're used to waking up with an alarm, this can be a challenging task. You could try for a minute right now. Check the time and note it. Close your eyes. How close are you to one minute when you open them back up? Did you hit it right on on, or did you go over/under? Practice. You'll get better.
It wasn't so long ago when I caught this duck fight on video. After checking my phone, I saw that I came out of horse stance a little earlier than I wanted. The ducks were being a little more rambunctious than usual so I decided that I would film them. The next thing we see is the fight taking place.
It is difficult to catch these sort of things on video. If you don't already have the video out and rolling, the scene may be over by time you: unlock your phone, press the camera button, press the play botton, and point in the direction of the scene. This happened to me when I wanting to get an arial fight taking place between a crow and a sea gull.
Taijiquan is based off of watching a snake and a crane fight. Interesting what nature will teach if you can read the signs.