Well, I can test this out some more later on tonight.
The invader I had was kind enough to let me wack him with a broken trident +5 and I did only 7 damage, I had my lock on him while he took several swings from the merchant including a heavy attack, and it didn't show any numbers suggesting he was taking damage, when he finally killed me I was hiding behind the merchant, so he swung right through him and struck me down (while I was dancing with my trident!)..
Again, I am inclined to believe something went wrong on my part and that video is correct. But I will try to test this out more within the next couple of days and report what I see here when I have more information.
The invader I had was kind enough to let me wack him with a broken trident +5 and I did only 7 damage, I had my lock on him while he took several swings from the merchant including a heavy attack, and it didn't show any numbers suggesting he was taking damage, when he finally killed me I was hiding behind the merchant, so he swung right through him and struck me down (while I was dancing with my trident!)..
Again, I am inclined to believe something went wrong on my part and that video is correct. But I will try to test this out more within the next couple of days and report what I see here when I have more information.