Pulse wave use to have this line in its own discription..., Just for this very instance.
They decided to remove it from the PaC to conserv space and put it in the RB since it can apply to more than just PW.

Ignoring and countering are two different things.

in this case, if you ignore the giant, you can no longer draw line of fire so now you can't ignore it any more so now it becomes a giant again. (an endless cycle) this is wat that line above was specifically written for. Ignoring giant size cause you not to be able to ignore giant size. Therefore you do not ignore it.

Ignoring stealth is different. ignoring stealth allows you to draw line of fire.

Ignoring and countering are two different things.

in this situation no one is trying to counter Great size.

You can't ignore it either.

This situation seems unnecessarily complicated.

Where does it say it cant be ignored?

In the OP's example it can't be because of the situation, but if the PW'er was on the edge of elevation it could ignore GS and even deal knock back if he rolled doubles.

Reading through it and the rule book line again I think I understand why you cant ignore the GS. Since the two instances of ignoring are linked together despite having different qualifications if you ignore it during the drawing you wont ignore it in the continuation of the ignoring after lines are drawn.

Would this rule apply in the reverse situation too? Where A is still GS but is initiating the Pulse Wave. In this case when you are drawing your lines you would try to ignore your own GS but because after drawing lines you would not draw a line to yourself you instead don't ignore your own GS.

That would depend entirely if a Combat Symbol is considered a game effect. I'm leaning towards no, it's not, but I have nothing to support that opinion.

EDIT: Re-read the Rulebook. This is what I get for not quoting.

Certain game effects might knock back a character or allow a character to ignore knock back (examples– Powers: Charge; Abilities: Great Size; Other effects: Multi-base characters).

So, you are correct. Anything that would prevent Knockback is a game effect, so doubles on Pulse Wave will KB the un-KB-able. Good to know!

When using PW you do not ignore your self.

Basically if you ignore Giant Size you have a loop. If you ignore the giant size, the Line of Fire can't be drawn, but if the line of fire is drawn, you ignore giant size. The rule is there to break that loop. It could pick either conclusion, that the effect is not ignored or it is ignored no matter what. The rule states to not ignore the effect causing the loop. That's why Giant Size in that situation would not be ignored.

You actually can't knock back a multi-base character when using Pulse Wave and rolling doubles. Being multi-base isn't a game effect a character uses or possesses. It's just what they are.

Ok. I feel better about that now. Thanks.

A single based Great Size character (Kaiju) could still be Pulse Wave knocked back as their Great Size is an ability that is used and would be ignored during Pulse Wave.

When you are drawing the lines of fire for Pulse Wave can you ignore any game effects that are not possessed or used by figures you would draw line of fire to? For example the Shadowlands map effect.

It seems to me you would not be able to as you try to ignore it during the line of fire step and then it stops being ignored once you have drawn the lines of fire and the characters outside of the 6 square range become illegal targets as they neither use nor possess the map effect it simply is a restriction on targets.

you would have to have a PW'er with a 12 or higher range for this to be an issue.

If you can quote the map rules in question I'll try to answer your question though.

http://www.hcrealms.com/forum/showthread.php?t=346523
As for figures with greater than 12 range Dr. Manhattan, The Spectre and Old Galactus all top out at 16. Also anyone with 12 range and a modifier could get there as well.