1) In the following script the creep diver has only drove once to the spot. Also the marines hop in then drive a bit then hop out

(sound_looping_start levels\c10\music\c10_07 none 1)
(object_create c1)
(ai_place cov_creep1)
(ai_place creep_drivers)
(vehicle_load_magic c1 "" (ai_actors cov_creep1))
(vehicle_load_magic c1 driver (ai_actors creep_drivers/elite1))
(vehicle_load_magic c1 gunner (ai_actors creep_drivers/elite2))
(sleep 50)
(ai_command_list creep_drivers move)
(ai_magically_see_players cov_creep1)
(sleep 200)
(vehicle_unload c1 "")
(game_save_totally_unsafe)
(garbage_collect_now)
(rasterizer_decals_flush)
(sleep_until (= (ai_living_count cov_creep1) 0) 15)
(object_create warthog1)
(ai_place warthog1)
(vehicle_load_magic warthog1 driver (ai_actors warthog1/marine1))
(vehicle_load_magic warthog1 gunner (ai_actors warthog1/marine2))
(vehicle_load_magic warthog1 passenger (ai_actors warthog1/marine3))
(ai_command_list warthog1 pop)
(sleep 100)
(vehicle_unload warthog1 "")

2) In this cutscene the door doesn't unloack so the elite gets stuck

(script dormant cut_one
(fade_out 1 1 1 30)
(switch_bsp 0)
(player_enable_input 0)
(camera_control 1)
(cinematic_start)
(cinematic_show_letterbox true)
(camera_set cam3 0)
(ai_place elite)
(device_operates_automatically_set door1 true)
(cinematic_set_title door)
(fade_in 1 1 1 30)
(ai_command_list elite walk)
(camera_set cam4 100)
(sleep 60)
(fade_out 1 1 1 30)
(ai_kill_silent elite)
(cinematic_show_letterbox false)
(cinematic_stop)
(camera_control 0)
(player_enable_input 1)
(switch_bsp 1)
(fade_in 1 1 1 30)
(show_hud_help_text true)
(hud_set_objective_text obj5)
(hud_set_help_text obj5)
(sleep 150)
(show_hud_help_text false)
(game_save_totally_unsafe)
(garbage_collect_now)
(rasterizer_decals_flush)

Thanks for any HELP!