It isn't about "convenience." It's fairly clear. LINK
Ok, Let's look at this first. The camera pans through arguing heroes then focuses on the Rod as it flips over. Why else would a DP do this other than to convey information that this is not what it seems like? These people are not acting on their own...THey are acting contrary ("upside down") than they normally would.
This is a very clear indication that the characters are not in control, the Rod is. Therefore, it can break Hulk. Which gels with Loki's stated plan of getting captured in order to get the Rod in Banner's presence, it will "unleash" Hulk.
Let's look at it further: LINK
Here are the heroes arguing again. Notice at 43 seconds you see an undershot of Thor making him almost look drunk. Then Tony stumbles and rubs his eyes like he's under something. Then Banner talks about the "other guy," clearly as he picks up the Rod WITHOUT KNOWING IT.
Again, this is pointing to the Rod accessing the other guy and forcing him to pick up the scepter. Banner, who is notcurrently Hulk, does something that he doesn't control. Who does it? Oh yeah, "the other guy," specifically referenced in the sentence WHILE HE TAKES THE ACTION.
He then turns into the Hulk seconds later.
I see this referenced too many times as a knock on the Avengers. Like I said, it wasn't perfectly communicated. But it also doesn't come out of the dark either. The film is clearly trying to tell the audience, "Something is up," the rod flip shot and drunk Thor are giant red flags at least.
This post was edited on 7/16 at 2:11 pm