2 questions

By Uncle Joker, in 2. AGoT Rules Discussion

(a) If I play Narrow Escape during my Brienne Tarth (PotS) is attacking or defending, can my opponent discard his hand to cancel my Narrow Escape?

(b) Can Seasick cancel City of Spider?

Uncle Joker said:

(a) If I play Narrow Escape during my Brienne Tarth (PotS) is attacking or defending, can my opponent discard his hand to cancel my Narrow Escape?

Uncle Joker said:

(b) Can Seasick cancel City of Spider?

thank you,ktom