Magus Karl and the two guards had already accepted their deaths. A vampire spawn was an undead creature with strength comparable to a peak mortal. Moreover, their undead bodies and regenerative abilities made them difficult opponents to deal with.
The two guards stood no chance against a vampire spawn and neither did Magus Karl, who at this point was incapacitated. His old and feeble body could not even handle a single punch from the vampire spawn.
Furthermore, they knew that no matter how fast reinforcements arrived, they wouldn't be faster than their enemy who was right in front of them.
Just when all hope seemed lost, Magus Karl and the two guards saw a figure abruptly appear in front of them like a ghost.
Magus Karl was taken aback as he couldn't even sense just when this person had appeared. But what happened next shocked him even more.