Interesting how he found out his maid was a spy. This guys got brains..... and balls ^_~
Well I feel like there was a mistake in the black bubbles, I assume its suppose to be the maid talking how she cant see his stats. And from what I gather, she tried to cast a grade 7 spell (or magic item?) as a mental attack on the MC, but his magic defense activated and canceled it. Which is why he was able to retaliate against her.