Years of experience in the infantry actually, mainly as an M60 machinegunner, but also as assault pioneer (explosives, booby traps, field fortifications, etc) and rifleman.
Now, nobody said it was a knife fight either. Knives and bayonets are used in a totally different manner (most bayonets actually being blunt) and it's not
just the blade that's used. The whole weapon is used to parry the enemy rifle out of the way, the butt can be smashed into them in both a swinging hit or reverse thrust, the blade of course can also be stabbed or slashed.
And don't forget that bayonet fighting is a whole body experience - elbows, knees, boots, anything in the right place at the right time can, and
should, be used.
Pure agression plays a huge part too as indicated in
http://au.youtube.com/watch?v=...&feature=related
Now imagine how you'd feel if that madman was coming at you screaming like that?
Bayonets are NOT suprise or stealth. They're for taking the fight in close and personal to the enemy and either killing them outright or putting enough of a scare into them that they either freeze, or bolt. Bayonets are all about intimidation, showing the enemy you have no fear (even though you'll probably need to change your own underwaer afterwards).
They are not however a weapon of first choice. If your rifle is in working order and you've got ammo in the chamber, then that's got to be the first option. If however ammo is short, you've got a stoppage, or a multitude of other problems, AND you're within just a few metres, the bayonet is a serious option.
As previously stated, they give you a rifle so you can shoot the enemy, but they also issue bayonets....
http://au.youtube.com/watch?v=_eI2Ef7sH8c
No, getting down to game mechanics, as long as the attacker starts the phase/turn (depending on edition) within trotting range (16 metres 2.0, 20 metres 2.2) plus the weapon range (2 metres S, 3 metres L), then an attack can be made. As Varis has got to be within the 22 metres of his closest potential target, a strike should be possible.
The age of the enemy was described as roughly 20 years, so I would think they're probably fairly inexperienced also (but on the other hand, this is T2K, they could be a combat hardened veteran). A screaming Ukrainian charging at them with a wild look in their eyes and aproximately four kilograms of rifle shaped club in their hands would have to warrant at least a panic check...