AlliedModders - [ H3LP ] Wall climb problem?

Take a look at my alien wallclimb class:
PHP Code:

		
			
#include <amxmodx>
#include <colorchat>
#include <fakemeta>
#include <fakemeta_util>
#include <FurienClasses>
#include <fun>
#include <hamsandwich>

#define PLUGIN_VERSION "1.0"

new const g_szPrefix[] = "^1[^4iPlay Furien^1]"
new bool:g_blClass[33]
new Float:g_flWallOrigin[33][3]
new g_iClass

#define CLASS_NAME "Martian"
#define CLASS_DESC "\y[\rHP- | G- | NP | WallClimb\y]"
#define CLASS_MODEL "iplay_martian"
#define CLASS_KNIFE "models/iplay_furien/v_martian.mdl"
#define CLASS_TYPE "VIP"
#define CLASS_HEALTH 120
#define CLASS_SPEED 750.0
#define CLASS_GRAVITY 0.5
#define CLASS_INVIS true
#define CLASS_PARA false

#define WALL_DISTANCE 25.0
#define WALL_SPEED 160

public plugin_init()
{
    register_plugin("Furien Class: Martian", PLUGIN_VERSION, "OciXCrom")
    RegisterHam(Ham_Spawn, "player", "eventPlayerSpawn", 1)
    register_forward(FM_Touch, "fwdTouchWorld")
    register_forward(FM_PlayerPreThink, "fwdPreThink")
}

public plugin_precache()
    g_iClass = RegisterAlienClass(CLASS_NAME, CLASS_DESC, CLASS_MODEL, CLASS_KNIFE, CLASS_TYPE, CLASS_HEALTH, CLASS_SPEED, CLASS_GRAVITY, CLASS_INVIS, CLASS_PARA)

public eventPlayerSpawn(id)
{
    if(is_class(id))
    {
        ColorChat(id, TEAM_COLOR, "%s Your Alien Class is ^4%s^1. You have decreased health and gravity.", g_szPrefix, CLASS_NAME)
        ColorChat(id, TEAM_COLOR, "%s Press E + W/A/S/D to climb walls. You're invisible when attached to a wall and not moving. You have no parachute.", g_szPrefix)
        g_blClass[id] = true
    }
    else g_blClass[id] = false
}

public fwdTouchWorld(id, world)
{
    if(!is_user_alive(id) || !g_blClass[id])
        return FMRES_IGNORED
        
    pev(id, pev_origin, g_flWallOrigin[id])
    return FMRES_IGNORED
}

public fwdPreThink(id) 
{
    if(!g_blClass[id]) 
        return FMRES_IGNORED
    
    new iButton = fm_get_user_button(id)
    
    if(iButton & IN_USE)
        wallclimb(id, iButton)

    return FMRES_IGNORED
}

public wallclimb(id, iButton)
{
    if(!g_blClass[id])
        return FMRES_IGNORED
        
    static Float:flOrigin[3]
    pev(id, pev_origin, flOrigin)

    if(get_distance_f(flOrigin, g_flWallOrigin[id]) > WALL_DISTANCE)
        return FMRES_IGNORED
    
    if(fm_get_entity_flags(id) & FL_ONGROUND)
        return FMRES_IGNORED
        
    new bool:blInvis = true
    static Float:flVelocity[3]
    
    if(iButton & IN_FORWARD)
    {
        velocity_by_aim(id, WALL_SPEED, flVelocity)
        blInvis = false
    }
    else if(iButton & IN_BACK)
    {
        velocity_by_aim(id, WALL_SPEED * -1, flVelocity)
        blInvis = false
    }
    else
        velocity_by_aim(id, -1, flVelocity)
        
    if(iButton & IN_MOVELEFT || iButton & IN_MOVERIGHT)
        blInvis = false
        
    if(blInvis)
        set_user_rendering(id, kRenderFxNone, 0, 0, 0, kRenderTransAlpha, 0)
    
    fm_set_user_velocity(id, flVelocity)
    return FMRES_IGNORED
}

bool:is_class(id)
    return (get_user_team(id) == 1 && FurienGetAlienClass(id) == g_iClass) ? true : false