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West Odessa. Cosgrach frowned a little, but then smiled. "Morning, Mr. Odessa."
He closed the door once Vesper'd entered and turned to the class. He was stading at the right side of the picture not to block their sight, and grinned at them.
"Welcome to the first class of this term," he said, "I'm Cosgrach Culloden, for those who don't know me, and this is my second term teaching." So, NO 'Collarbin, Dima and Lucy, see? C-U-L-L-O-D-E-N. His eyes were on Alexa, though, and his teeth were clenched momentarily before he relaxed himself. Today was a beautiful day, and it would be even better when he and she had a chat at his office.
"Today, we'll brew a strength potion that will enable you to," he took a deep breath not to laugh, "lift a car like I'm doing in this picture. Not just for entertainment, though. It was used to carry all kinds of material in the past, beginning from ancient times, for building and stuff," yeah yeah, he didn't know why else people moved stuff and they shouldn't question that, that wasn't the point, "so we see some of those historical buildings thanks to it." He grinned proudly. They could tell it was one of his favourite potions. "It is very easy to brew, and it is good for anaemia, lack of red blood cells in the blood. It makes you dizzy and causes lack of strength, so if you don't want to bother with a proper health potion," or lack the ability to do it, "I suggest you brew this. It's also good for lack of iron, so let's start brewing!"
He didn't want to fold his amazing picture, but the kids should also learn this potion, so he tapped his wand at it and it folded itself to open the blackboard.
"As dragon heart is actually expensive, and rare," he eyed them all for it to sink, "you have to use it carefully. One heart should be enough for all the class, and uh," he glanced at his empty table, "I'll bring it and the scale while you do the first step." No one sight problems, he hoped? He didn't need to read it out himself, right?
Right.
With that, he quickly opened the door of store room and entered to get them. OOC: The class has started, so please do not post your characters arriving late. Just act as if they have been there all along. 
The class will continue about 11 hours later. And what was the frown for? West gave the professor a surprised look but shrugged it off. Maybe Culloden had gas.
.... or maybe he'd been drinking blood by the bucketful? West eyed the ingredients list dubiously. You wouldn't want to get it wrong since then you'd apparently just be drinking meaty blood with pomegranate to taste. But as long as you did it right and the potion's magical effects took hold correctly then you wouldn't technically be drinking blood, you'd be drinking a Strength potion. Different.
Morally he had no problem but he did glance toward Mo, wondering if his friend might take exception. Not that the creatures involved were alive or anything....
He cleaned his cauldron quickly and effectively with the usual spells, then set up all the ingredients that he'd need aside from the measure of heart.
He measured the 2 litres of water into the cauldron then dropped the two unicorn tail hairs in one at a time.
First step completed.... and not that he was exactly going to pull a Toby and offer to help people, but West figured if someone asked... or rather, if a Slytherin asked, then he'd probably help. For now though he just sat quietly and waited to get through the task.