Immobilized by fear

It does not seem that nearly 14 years have gone by since Saving Private Ryan (1998) established itself as one of the greatest films of all time, but do the math.  Ten years prior, Young Guns (1988) popularized wild west outlaw "Billy the Kid's" life and myth for a new audience.  There is a scene in each film that memorably depicts individuals who, experiencing fear, initially neither fight nor flee.  In Saving Private Ryan, Private Upham remains frozen in a stairwell, backed against the wall, not by a foe but by his own fear, while his fellow soldier is engaged in a life or death, hand to hand, combat with a German soldier.  Upham could come to his aid, and he knows he should, but he is too terrified to move.  Curiously, the German soldier, after killing Upham's friend, meets Upham on the stairs while exiting the bombed out building, but he does nothing.  During the shootout at the McSween House in Young Guns, Billy Bonney berates fellow gang member Charley Bowdre for cowardice.  The bullets, glass, plaster, and wood splinters flying from the outer barrage have frozen Charley with fear.  At the instigation of Billy, and pushed to the limits of his fear, Charley channels it into the will to fight, earning Billy's praise.  In both instances, different results arise from a shared inability to function upon confronting fear.  How would Charley act if Billy was not watching and goading?  Would he remain with his back to the wall like Upham?