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The first thought that came to mind when analyzing Scar's usage of Crimson Current was the size of the wave.
Although Scar didn't add or subtract anything from what Kieran supplied to the skill, the tide seemed three times smaller than when he released it.
However, that size difference was temporary. Once the current touched the floor, it expanded faster than Kieran could comprehend, regaining its former yet somehow improved glory.
'The force of the current was like getting hit with a wrecking ball unexpectedly. Furthermore, rather than fixate on hitting me with the first attack, Scar turned it into an attack that gained extra momentum.
From Kieran's perspective, he felt Scar fused the principle of Seethe Burst with Crimson Current because the rapid explosion of momentum was eerily similar to when the blood coating erupted.