I'm 90% sure the 'similar flowers' was him comparing Shuhang to Slow-witted Song. He was saying Shuhang's not SWS's next life, they're just similar entities. Considering the items that were in the treasure place, it's most likely that SWS contacted him at some point
His hand accidentally slipped and he used a technique... how ingrained are the motions of his (new author favorite) cure all technique that he can do it on accident?
It’ been a long time since Song Shuhang’s full daoist name has been mentioned. It always used to be “Tyrannical Saber” up until now. If one of the immortals were to join the group chat, that would be pretty interesting!
Song Spirit Ghost One
The restrictions on him were that of being a former ruler of the netherworld, huh... But does the "Big master" mean his counterpart or someone more mysterious?