@Richi007
>>afak every vec_ function returns the first parameter (a vector) as return value

hmmm then it may be just an expected behaviour, that the function behaves as you showed..
@ventilator
yep ^^

@ratchet
the level was created in blender and then imported in MED and then in WED I just added some lights...

nope attaching a script in WED won't do anything I guess !
but assigning skills works of course, thus there are several possibilities, hard code the entity-function relationship or assign them according to a skill value, or even type of entitity !