From the body language, I would guess that he is an AME looking to resolve a technical issue. Climbing up and down aircraft with things rotating is commonplace in the industry (but may not be best practice!).
The PIC could well be flying from the left hand seat if the aircraft is on slingload/bucketing/longline operations. Why? because you can look out of the bubble window in the co-pilots door, see the load and still reach the collective (almost impossible in the right hand seat).