nostr:npub18g4k0gljynatgs2anultm3y55tmd2qjxra8wgywe8nqr3cr26g4qe2n4gd If instance A "suspends" instance B, the effect is always mutual. Users on both instances will not be able to see their content or follow each other.

If they just "limit" instance B, 
users on both instances can still follow each other. Only then users will see content from followers.

This is how Mastodon works.