The audience started fearing that Oni King was about to come back to life after watching what Eren was doing with his corpse. An irrational fear that only affected their minds for a second before logic took control of their faculties once again.
They observed that although Oni King's body had been somewhat restored to its original form, it was still a corpse. Alephee then cast her sealing spell on the monster's corpse, making it seem like it had been frozen with a layer of ice on it.
'You can now store the body. I… I'll take a short nap if you don't mind.'
'Sweet dreams.'
Eren smiled and replied. He then used his wind blade tornado spell to bring over to him the frozen-in-time corpse of the Oni King before taking it into his storage. He left the chopped arm of the Oni King on the floor. Alephee had sealed it with her sealing spell, so there was no blood leak.