If the link points to youtube (not talking about the text, but the link shown at the bottom of the browser if you hover over it) it should be generally safe.
@MMagdy In the video the player seems to get damage but is immediately healed again. Find out which mod does the healing and read its code to find out how it is done.
that safe zone appears to be a trader and yes i see him taking small damage from the barbs as well and they dont do all that much damage but slow you down (if you are on foot).