You can see at 8:40 he had a problem with katabatic wind what mixed to "normal" wind. he did good decision and went around. First climbing surprised him and next he didnt use a full throttle for take off.
It was quite windy day from the morning. I was surprised, that sun and wind opened sky very late. First flight we flew about 200ft AGL at the beginning...
Demo of our X wind approach technique (not to be attempted without proper instruction), flown during a typical day of many and varied aircraft movements.