Interestingly, we're looking at the same video. I'm seeing a person who's pocket explodes and the person standing nearest them happened to be lucky enough to not be in the direct path of the blast. I can easily see that detonation severely wounding a bystander if they'd been in the (un)lucky angle and height.

They would have to be pressed up against the target - even a couple inches away they would not be harmed.

Sure, it's possible theoretically for that to happen, but as a whole, this attack is incredibly precise and targeted.

I wouldn't even shoot a nail gun the opposite direction without safety glasses. People are gonna be blinded or vision impaired by the shrapnel just from happening to shop nearby someone with one of these pagers.

Both things are probably true!