Get real ! What's physical in holding a rifle against those who are unarmed ? Sheila had the upper hand and had been determined to shoot !
What would you have done--------------talked her to death ??
Unfortunately, (as you said) Sheila had to put the silencer on & take it off.
She also had to chamber, load & breach the rifle (twice). Win a fight with a 6.4, 15 stone male, read the bible & accurrately fire 26 shots, some into a moving target.
Sheila was not able to get off sofa's without help. Or put sugar in coffee.