L was not amused, and kept his hold on Light's wrist, speaking, "I refuse to do so until you're calm. You've done nothing but panic ever since you learned the cake might be laced with something unusual. It might help if you sit back down. Not to mention, you should know panicking will only make whatever we ingested work faster." L had no sympathy for Light's current situation, even if he was partially to blame for it. Of course, he wasn't entirely aware of what Light was going through, but the fact that Light wasn't making this any easier certainly didn't help warm L's cold heart any faster. For emphasis, L tugged lightly on Light's wrist in an attempt to encourage him to sit down (if Light refused to cooperate, he may find himself being tugged a little harsher).