I have felled a couple of old apple trees in my garden with a chainsaw after watching a "few Youtube videos".
The trunks were maybe 30 to 40cm in diameter so obviously much smaller trees than that sycamore (well apple trees for a start and much younger) and I can tell you that this is one of those things that looks easy when you watch but not so much when you do it. Handling a chainsaw to be able to make clean, straight cut through takes practice and you need a good chainsaw as well.
So IMHO there is no chance in hell that the sycamore was felled by an amateur.
I believe that one has to be at least 16 to become a trainee so maybe that 16 year old has received previous training and/or his family works in the field. Or he didn't do it himself.
The trunks were maybe 30 to 40cm in diameter so obviously much smaller trees than that sycamore (well apple trees for a start and much younger) and I can tell you that this is one of those things that looks easy when you watch but not so much when you do it. Handling a chainsaw to be able to make clean, straight cut through takes practice and you need a good chainsaw as well.
So IMHO there is no chance in hell that the sycamore was felled by an amateur.
I believe that one has to be at least 16 to become a trainee so maybe that 16 year old has received previous training and/or his family works in the field. Or he didn't do it himself.