“I’m alright. I wanted to test your spell. I didn’t want to put anyone in danger if it didn’t work.”
LOL I *love* how the entire reason Severus is upset is the very reason that Harry can't seem to grasp! Harry's actions seem to render him pathologically incapable of realizing that someone might care for *him* - Snape has this trait as well (that's why it's all the funnier when *he* gets upset over a trait that both he *and* Harry possess and act on!^^)