If Yasuo has Svellsongur attached and attacks, triggering his ability twice, can Not So Fast counter both triggers or only one?

Ruling: Not So Fast can only counter one of the two triggers. Yasuo with Svellsongur attached has two separate triggered abilities that each trigger independently and become separate items on the chain, but Not So Fast can only target one spell or ability.

Sequence:

• Yasuo with Svellsongur attacks
• Both triggered abilities trigger separately
• Each trigger becomes a separate item on the chain
• Not So Fast can only target and counter one of these chain items