And Valeris, being a Vulcan, had the strength to hold them while she did it.
Umm, why would she need to hold anybody?
I mean, she's killing people by firing a phaser at them at stun setting. Surely she would start
by firing a phaser at them at stun setting, making them unable to resist the subsequent sustained head shots.
The Jem'Hedar carbines seem to work that way.
They are said to transport a toxin into the victim. But for all we know, phasers are also weaponized transporters... At least we saw a phaser transport nanoprobes to the victim in VOY "Macrocosm".
Perhaps the stun setting of a phaser consists simply of a beam that transports a tranquilizing chemical into the victim?