(It's late, but worth it.)
Seer Fox laughs as the crash-dummy he dressed up in his robes is smashed to pieces by Bladesinger.
He then grabs hold of Bladesinger and nails him to the ground, and then slowly pulls out toenails, his fingernails and his teeth with a pair of pliers, then he pulls out every hair on his body (Oh yes, EVERY hair) and slices off the first layer of skin, continuing down through all the layers until it reaches his muscles, then gives him stimulants so he doesn't pass out or die for a while (In fact, better do that at the start too).
Then Seer Fox pours vinegar all over Bladesinger, then rubs salt into his organs, then delicately carves out the back of the eyes, scooping out all of the jelly in them and forcing Bladesinger to eat it before cutting off his tounge and after a short dicing feeds that to him as well.
Then Seer Fox borrows the interrogation weapon from a Dark Angels Interrogation-Chaplain and strokes it down all of Bladesingers exposed nerve endings, then puts his genetailia in a vice that he tightens veeerrrrryyy slooowwllllyyy until the vice is fully closed, then using a liquid nitrogen spray rips the vice, and the genetailia, off his body, then treats all the blood flowing from him.
Then Seer Fox cuts off Bladesingers nose, only using tiny scratches at a time so he can still feed the clumps to him, then starts shaving off the toes and fingers, being careful not to spill to much blood while still feeding him the body parts, then he carves open the rib-cage and begins cutting up the liver, feeding it to him as he goes, then one lung, then the fat around his heart, and finally his kidneys, all the while cutting with a very blunt instrument.
Then finally Seer Fox borrows a Tyranid Devourer and shoots Bladesinger in the both legs, as then the worms have to travel up the nerves and spinal coloumn further, causing him more pain. Seer Fox then crucifies Bladesinger on a large, rusty pole until he dies, all the while Listening to a constantly repeating telling of Farseer Del's 'Black and White Space Marine on a Black and White Bike' joke and my 'Three Purple Men' joke; forever proving that you should NOT MESS WITH FARSEER FOX.
Period.