Both of them saw thar there are already many undeads roaming around in the bottom.
Sans then took out the pearl that absorb the low level undeads.
He then started chanting and numerous undeads were thrown into the bottom.
Seeing the dense amount of undeads Sans thrown into the bottom Shadowslash asks "How many undead did you throw?"
Sans answered with an emotionless tone "One thousand"
Shadowslash couldn't help but clicked his tongue as these undeads would immediately starts to devour each other considering their number at least 100 of them would became high ranking undeads.
Sans then once again started chanting and a large amount of death qi flew out from his pearl further improving the environment of the Undead Pit.
Looking at the chaotic scene below and feeling that the Undead Pit is much more amazing than before Sans satisfiedly nodded.