Alexander's eyes burst open in shock, why was he feeling the pain, he had already taken the antidote. He shouldn't be feeling the pain even if Klaus recasted the spell.
He had no idea how Klaus was able to cancel the spell, it doesn't work that way, even he wouldn't be able to cancel the spell that was why he created an antidote for it, but Klaus canceled the spell and also recasted it.
For goodness sake this was his own spell, the kid didn't even know the words to say, how then did he cast the spell.
Alexander was confused but his health was on the line.
He quickly opened the drawer on the table and fetched out more of the antidote.
"There is no need to take more, it wouldn't work, soon you would experience a pain far beyond what you experience earlier"
Alexander turned to face Klaus then and Klaus continued.