If Namor/ Tempest or other aquatic symbol figures are in water and use the feat Submerged, does that stop Smokey Foot Cap's power? Does it mean that his line of site is blocked and he can't range attack them?

With so much water on the map I'm thinking of using SI Namor and Tempest, giving both Submerged feat.

Thoughts?

I'm thinking Captain America would still trump Submerged.

Submerged reads "When the character occupies water terrain, lines of fire drawn to it are blocked."

Deflection Trajectory reads "Captain America's line of fire is blocked only by walls and indoor blocking terrain."

Since Submerged does not create walls or indoor blocking terrain, Deflection Trajectory should still work just fine.

I would rule it in favor of submerged for logic and rage for this Captain America SP ... But unfortunately "only by" is too much strong to go against it ...

Unknownronin is very correct

Logic has no place in a rules discussion

Actually logic needs to be present in every rule discussion.
However, the starting point needs to be found in an official Heroclix document, not the so called 'real world'. That's where some people get lost...