In Alex's field of view, his friends might as well be moving at a snail's pace and could defeat them without thinking too much about it. But that would defeat the purpose of this spar.
He wanted to see how far they'd come and how strong they were. He wasn't particularly sure how strong Class D awakened were supposed to be as he had no reference. Moreover, his friends were anything but normal.
Alex's eyes darted around as he followed their movements. First, he dealt with Ross's overhead strike, ignoring the intense heat of his flames. Flames powerful enough to melt magical steel like butter.
If Alex hadn't coated his armour in a ward of defensive light, his armour would have melted. And that was when the armour was capable of taking attacks from Class B hunters.