ok, this might be confusing, so ill try to explain it the easiest way possible.

Lets say Magog is based with batman. Four squares away from magog is superman. Batman and superman are on the same team. Magog is their opponent. Magog has a clear line of sight, and range to superman. he also has Ranged combat expert. If he rolls to break away from batman, and successfully breaks away, can he stay where he is and take a shot at superman with RCE?

Thanks, and rep to everyone who helps out.

Break away only occurs when the character tries to move. RCE requires a power action to activate and does not allow movement during the action. If you choose to break away then you can't RCE. If you choose to RCE then you can't break away.

When a nonflying friendly character is based to another nonflying opposing character, the nonflying friendly character cannot make a ranged attack. Magog cannot RCE Superman when based to Batman.

Speedster is correct

As of the current rules set, if you are based, you can never range attack a figure you are not based with. You can attempt to use Running Shot to move away and then attack (but you must not be based when the movement ends, so no 0 move breakaways), but then you couldn't use RCE anyway.

Tarnish

It did sound a little strange. thanks for clearing it up

Even easier:

Legion rulebook page 25 (Ranged Combat):

To make a ranged attack "your character is not adjacent to an opposing character".

As long as Batman is adjacent to Magog, Magog can't make a ranged attack.

Fliers have it a bit differently (pg 26):
RCA vs Hovering Characters (soon to be fliers )
Hovering characters can make ranged attacks against ADJACENT opposing characters...however they can't make ranged combat attacks against nonadjacent characters when the hovering figure is already adjacent to an opposing figure.

Hope that helps.

I hope they change the Flyer-to-flyer; flyer-to grounded rules and just go with the adjacency principal:

Ranged combat attacks or actions may only be used against characters that are not adjacent.

I've been rooking guys left and right because I base them with Super-nova and they forget he can be RCE'd by a grounded guy. It's almost unfair...

They will learn at some point... I hope.