You basically don't knife people from the front. If you do, there's a chance they will counter-knife it and theres pretty much nothing you can do about it. My understanding is that if you knife from behind, they cannot block it, so that would be an appropriate place to knife from.
On the other hand, if you want to counter knife someone else who is attacking from the front, just mash the melee button and you will. It's really easy actually.Technically you'll see the action to counter knife right before the enemy hits you, but I just mash melee and it still counters for me.
Ya I never knife from the front but i guess its possible they turn when they possibly hear me or get alerted by one of their peeps...so i just mash the same right joystick to defend like if i was going to knife them?
Having lots of fun sniping..finally got the straight pull unlocked
Lately it seems im getting out gunned by the peeps with the LMG's so I just unlocked the type 88 and did some dirty work with the irnv scope in the woods
Yeah, just mash whatever your melee button is (I play on veteran controls so I may have different controls than you). LMG's can absolutely wreck people in this game, especially if the guy is using a bipod. The bipod basically makes the gun into a hyper accurate turret, so watch out for that.
By the way, about the melee, sometimes you can knife someone, get counterknifed, struggle for a second, but overpower their counterknife and melee them. In a lot of cases someone intervenes while all this is happening, but yeah its definitely interesting the way the BF4 melee system works.