I torqued my knee during training last night. I didn't properly pivot my foot while executing a low roundhouse kick. It wasn't even full speed or power. I was just kind of casually going through the motion of the technique (in hindsight, that probably wasn't very wise) while the instructor was explaining the proper concept to a new student. I felt a pop, my knee buckled, and I went down. It was very embarrassing. I'd say the pain was maybe 4 0r 5 on a scale of 1 to 10. Certainly not what I'd call excruciating. The instructor kept me down for a few minutes, applied an ice pack, and checked my range of motion. Everything was fine, and the pain subsided pretty quickly. finished the class with minor discomfort. I even sparred later on with no issue. Afterwards, I went home and popped an anti-inflammatory before going to bed. I woke up at 3:00 am in excruciating pain, and could barely get out of bed. I limped my way into work this morning very slowly. I had some very important things to do first thing, so I didn't seek medical attention right away. By about 10:00 am, I was down to minor discomfort again and was walking without a limp. I've done a bit of reading on torn ACL's, but it doesn't feel that severe. At what point should I be concerned enough to seek medical attention? I'm not used to being injured. I don't want to waste anyone's time over a little twisted knee that I could just walk off.