There’s no swim animation for Limelight (but there should be), however, there is one called crowdsurf_excited_loop that can be used:
Anyway, I tested it out on writer’s portal and came up with this code:
EXT. OCEAN - DAY
@zoom reset
@YOU spot -1.181 -132 892 AND YOU faces right
@YOU walks to spot -1.181 586 892 in 4 AND YOU does it while crowdsurf_excited_loop
It’s the closest thing to swimming I could find for the limelight style : )
-Much Love JemU776 
