What incorporeal creature in 4e D&D can the fighter not physically interact with?
How hard do you think it is for a skilled invisible, silenced fighter to use their weapon to bundle their enemies into a group where they can then attack them?
What save are you talking about?
The fighter doesn't move when you use CaGI. How then are they "bundling" their enemies into a group, especially if they're invisible and silenced? It doesn't matter in 4e, because all that matters is what the rules widget reads.
Because it's very important that wizards be immune to clever battlefield manoeuvres performed by warriors! They're more realistic that way.
From a distance? And what about the archer on the wall I mentioned? Do they just throw themselves off it to get closer to the fighter?
Me too. And that shouldn't work in every circumstance.
What do you mean? They are making an attack. They must have line of effect to their enemies, whom they can see (as per the ability description). It seems obvious to me that they're doing stuff, which probably includes moving their body and interacting with their opponents.
By grabbing them, perhaps? By poking them with a sword? I am not a 7th level fighter, but my understanding is that one thing skilled and strong warriors are good at is using their own movements and bodies to force movements and reactions from their enemies.
As I said, you don't seem to be familiar with the forced movement rules. If there is an obstacle between the fighter and the archer (like a castle wall) then no forced movement occurs.
