This is on the YSL-353 I just obtained.
When moving the slide in to position 1 quickly, the outer slide lower tube end guillotines/pinches my left hand at the base of the small finger.
It happened several time so far and I am not impressed



This happens where the pouter slide travels into the recess near the end, where I hold the trombone with my left hand.
It is sharp and has no issues with drawing blood and pinching rather badly.
Does this happen to anyone else as well?
I have now filed that edge smoother but it can still happen due to its construction.
This does not happen at all on my Bach TB600.