Do the math. His 2-5 visible CW watts into a 5 foot cone into 25 foot is well above NOHD at one step forward into the beam at two and blows the NOHD everywhere at five watts. Without proper conditioning of the beam, it will have hot spots. Do not assume that less then two watts is safe, either. There is a probability curve for when the damage will occur.
NOHD is a statistical probability. The closer you get to the high end of it, the more likely you are to do actual damage.
Most laser safety and optical thresholds are calculated not to ensure any damage of all, but to have a low probability of damage occuring. NOHD is the one where the probability of damage is close to unity, ie will occur.
Ie, A 1 in 10,000 chance of some damage or death might be acceptable to Law Enforcement in a emergency. A 1 in 100,000 chance of death might be acceptable when doing off road racing.
I didn't come up with Batman. But I do sort of approve. When he asked me if I wished I could have upped the power, that is the clue that something is not quite right. I would not have needed increased power at all. In fact there is a clever technique to reduce it down to milliwatts. Scanning is one such way.
I have spent plenty of time in Less then Lethal land. Both Audio and Visual. Got to take a hit of nearly everything LTL but the Millimeter Wave. My boss tried it for me. Stood down range of my own optical and auditory products, too.
Primary requirement in that line of work, you are your own test monkey.
So are we going to take this thread so far as to teach people how far they can push eye exposure? On a forum mainly about having fun with pointers. Occupied mainly by young people who , for the most part, do not have the test gear, nor the product engineering experience to ensure safe guards?
This forum is here to educate and teach, and sell, and help with safety. Not to create possible accidents.
Upon this rock of technology comes often the need for Engineering Ethics. That is a valid branch of this discussion.
Steve