[GAMEPLAY] Sivir's Spellshield Blocks Brand Ult and Makes it Disappear, But Nocturne's Doesn't

Basically what the title says. Sivir's spell shield blocks Brand's ult and makes it disappear but Nocturne's doesn't. I was playing today and noticed Nocturne's spell shield blocked Brand's ult but it kept bouncing and did damage to me. Just wondering if this is a bug?

1. Use nocturne's spellshield
2. Brand ults nocturne
3. Nocturne doesn't take damage, Ult continues bouncing

Expected Result: Block Brand ult with spellshield and not continue to bounce

I can add video proof of both tomorrow if need be.