Was once attacked by 5 and on another occasion by 7.
But 20...or more. Not to panic, never panic. Well basic principles apply, don't get flanked and stop the leader (or leaders) first. In a subway/train car that shouldn't be too hard to manage.
And weapons? well.... a couple of 45s, big slow moving bullets that hit hard, stay in the target, and limit collateral damage.
When you must fight, fight hard.
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