Why do you have two pairs of shoes?
Grrrr - don't they make trees sturdier these days?! Tied some straw padding to the base of a tree and was using it to practice my gedan mawashi geri (lower roundhouse kick to you non karate folks). The idea was less about the power and more about the placement. Anyway, aside from the usual leaves rustling, I kept hearing this slightly hollow almost "twang"y sound I didn't recognise. I assumed it meant I was focusing the impact nicely.
Finished off, sat down to stretch...and a branch about 11 foot long, inch and a half thick came down out of the tree and clonked me on the bonce!
Lesson of the day folks - never sit under trees to stretch. And I have a headache.