"Don't worry. I assure you that the scene of Senior Brother Gao Sheng's sacrifice will be absolutely outstanding!" Song Shuhang quickly wore the daoist robe and got two bags of blood from Yu Jiaojiao, hiding them under his robe.
According to the script, he would play Senior Brother Gao Sheng's role and die in battle while protecting all the junior brothers and junior sisters busy running away from the sect.
He would even say a very cool sentence before dying... 'I'm the senior brother, and it's my duty to protect all these junior brothers and junior sisters. Therefore... leave the enemy to me. I'll hold them back for you!'
Afterward, Senior Brother Gao Sheng would die in the middle of the secret passage while blocking tens of enemies from the demonic realm all by himself, finally getting stabbed to death.
The daoist robe that Yu Jiaojiao prepared for Shuhang was also a particular type of stage prop, and there was a hidden mechanism inside.