// move toward ground
y += 4;

// contact player
if (place_meeting(x, y, obj_Player))
{
    if (obj_Player.passive_state = PLAYERPASSIVE_STATE.BURNING_STATE)
    {
        obj_Player.burning_duration = obj_Player.burning_duration_max - 100;
    }
    else
    {
        obj_Player.oiled_duration = obj_Player.oiled_duration_max - 50;
        obj_Player.passive_state = PLAYERPASSIVE_STATE.OILED_STATE;
    }
    instance_destroy();
}

// contact surface
var oiled_surface_attempt = instance_place(x, y + 1, obj_Floor)

if (oiled_surface_attempt)
{
    if (oiled_surface_attempt.state = SURFACESTATE.FREE_STATE) || (oiled_surface_attempt.state = SURFACESTATE.WET_STATE)
       || (oiled_surface_attempt.state = SURFACESTATE.FROZEN_STATE) || (oiled_surface_attempt.state = SURFACESTATE.ELECTRIFIED_STATE)
    {
        oiled_surface_attempt.count = 1;
        oiled_surface_attempt.state = SURFACESTATE.OILED_STATE;  // oil turns free/wet/frozen/electrified surfaces to oil
    }

    instance_destroy(); // destroy self either way
}