Nagini omvandlades inte till Bathilda - hon var i Bathildas lik.
Nagini hade inte omvandlats till Bathilda, hon var inne i Bathildas döda kropp. Det var därför som Harry tyckte att Bathilda eller hennes hus luktade illa.
“She smelled bad, or perhaps it was her house: Harry wrinkled his nose as they sidled past her and pulled off the Cloak.”
- Harry Potter and the Deathly Hallows, Chapter 17 (Bathilda’s Secret)
Senare luktade Harry något som han trodde var som bortskämt kött - för att Bathilda verkligen var ett lik.
“Thick dust crunched beneath their feet and Harry’s nose detected, underneath the dank and mildewed smell, something worse, like meat gone bad. He wondered when was the last time anyone had been inside Bathilda’s house to check whether she was coping.”
- Harry Potter and the Deathly Hallows, Chapter 17 (Bathilda’s Secret)
Nagini verkar inte ha kunnat göra magi, och i Bathildas lik var det ganska klumpigt och långsamt.
“She seemed to have forgotten that she could do magic too, for she lit the candles clumsily by hand, her trailing lace cuff in constant danger of catching fire.”
- Harry Potter and the Deathly Hallows, Chapter 17 (Bathilda’s Secret)
Slutligen, när Nagini var redo att attackera Harry, bröt hon ut ur Bathildas lik, och lämnade liket att kollapsa och falla bort.
“And in the instant that he looked away, his eyes raking the tangled mess for a sword hilt, a ruby, she moved weirdly: he saw it out of the corner of his eye; panic made him turn and horror paralysed him as he saw the old body collapsing and the great snake pouring from the place where her neck had been.”
- Harry Potter and the Deathly Hallows, Chapter 17 (Bathilda’s Secret)
Det var inte en omvandling eller illusion - Nagini använde själva liket som en förklädnad.