[MX04]How come sometimes you don't have to use a dynamic reference to a clip?

I’ve never quite understood this.

I’am dynamically loading 3 clips using an array to reference them:

code:

---

_root.holdingClips_array[g].loadMovie("MAIN/players/CARD/ten.swf", get);

---

Now, all this works fine & dandy, however if I want to use “getBytesLoaded” in an “onEnterFrame” like this:

code:

---

_root[holdingClips_array[g]].onEnterFrame=function(){

			Time+=_root[holdingClips_array[g]].getBytesLoaded

		}

---

Then I have to enclose the reference in brackets [ ], like:

_root[holdingClips_array[g]]

I know using this technique creates a dynamic reference to the clip, but how come it works in the first example given above without the brackets?