Sorry I'm a couple sets late, but I just thought of this question, and did not see it posted about already (so maybe the answer is obvious).

WEAKEND UNI-VISION: Cosmic Hulk's line of fire is blocked only by blocking terrain and walls. Cosmic Hulk ignores the hindering terrain defense modifier when attacking.

Does this mean that Cosmic Hulk does not have to be on the rim of elevated terrain to shoot someone on a lower level, and conversely can shoot someone on elevated who is not on the rim while he (C.H.) is on a lower elevation?

Thank you in advance for your time with this and have a great evening!

That is what it means.