What's wrong with this forEach-code?

[roguetrooper 2]

The player is west.

I want all east units to join an east general.

But this code also joins the player into the general's group :confused:

_exclude = [general, dummy];

{ if ( (side _x == EAST) and !(_x in _exclude) ) then ([_x] joinSilent general) } forEach allunits;

Meanwhile I found another method that works. But just for couriosity, why does the code above also joins west units into the general's group?

[shuko 45]

then {}

not

then ()