public Action:OnPlayerRunCmd(Client, &buttons, &impulse, Float:vel[3], Float:angles[3], &weapon)
{
	if(IsClientInGame(Client) && IsPlayerAlive(Client))
	{
		if(g_bKnockBack[Client])
		{
			if(!(GetEntityFlags(Client) & FL_ONGROUND))
			{
				vel[0] = 0.0;
				vel[1] = 0.0;
				vel[2] = 0.0;
			}
			else
			{
				new Float:Velocity[3], Float:Speed;
				GetEntPropVector(Client, Prop_Data, "m_vecVelocity", Velocity);
				Velocity[2] = 0.0;
				Speed = GetVectorLength(Velocity);
				NormalizeVector(Velocity, Velocity);
				ScaleVector(Velocity, 500.0);

				if(Speed == 0.0)
				{
					g_bKnockBack[Client] = false;
				}
				else
				{
					if(Speed >= 1000.0)
					{
						TeleportEntity(Client, NULL_VECTOR, NULL_VECTOR, Velocity);
					}

					vel[0] = 0.0;
					vel[1] = 0.0;
					vel[2] = 0.0;
				}
			}
		}
	}
}

public Action:Hook_OnTakeDamage(Client, &attacker, &inflictor, &Float:damage, &damagetype)
{
	if(!(1 <= inflictor <= MaxClients && GetClientTeam(Client) != GetClientTeam(attacker)))
	{
		return Plugin_Continue;
	}

	new String:WeaponName[32];
	GetClientWeapon(inflictor, WeaponName, sizeof(WeaponName));

	if(StrContains(WeaponName, "knife", false) != -1 || StrContains(WeaponName, "bayonet", false) != -1)
	{
		GiveKnockback(attacker, Client);
		g_bKnockBack[Client] = true;

		damage = 0.0;
		return Plugin_Changed;
	}
	return Plugin_Continue;
}

GiveKnockback(Client, Target)
{
	new Float:Pos01[3], Float:Pos02[3], Float:Vector[3];

	GetClientAbsOrigin(Client, Pos01);
	GetClientAbsOrigin(Target, Pos02);

	Pos01[2] = 0.0;
	Pos02[2] = 0.0;

	MakeVectorFromPoints(Pos01, Pos02, Vector);
	NormalizeVector(Vector, Vector);

	if(!(GetEntityFlags(Target) & FL_ONGROUND))
	{
		ScaleVector(Vector, 350.0);
	}
	else
	{
		ScaleVector(Vector, 1000.0);
	}

	KnifeSound(Client);
	TeleportEntity(Target, NULL_VECTOR, NULL_VECTOR, Vector);
}