This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
Probably just muscle memory for throwing empty tubes for a couple years.
My guess is this one was a ‘dud’ and was being swapped out. Careless and dangerous, but not that far from understandable