He wasn't surprised that the potion was going to be administered in gaseous form. It was easier to get into the bloodstream and had the least chance of failing due to unforeseen factors during digestion.
He followed the instructions of the doctor.
"We will begin the procedure now."
A red gas passed through the pipes of the gas mask before he inhaled them.
His eyes widened as his pupils dilated.
He felt like he had just inhaled spikes into his lungs.
"Rgh!" He grimaced.
Sharp piercing pain ravaged his lungs, causing him to writhe in agony, doing his best to control his movements.
"Restrain yourself, Senior Quarrier."
It was easier said than done. Thankfully, he had been preparing for the torturous pain thus he was able to handle it a lot better than he could have otherwise hoped for.
An unknown amount of time passed as he endured the sharp stinging pain that ravaged his lungs.