Matthew blinked again at Stephen -- this one a blink of utter confusion, though a tear did roll down his cheek at this motion of his eyelids, and he hurried to wipe it away on his sleeve. "What? Oh-- yes, of course, you would have needed a wand to get past my wards, wouldn't you?" It was almost as if he'd completely forgotten that Stephen had just drawn his wand on him, in fact -- and perhaps he had, indeed, forgotten, so muddled were his thought processes at the moment. "Well, of course you've never seen me cry, Stephen! I mean, HONESTLY! Do you think I'm crying at the drop of a hat, or over spilled milk, or... something of the sort?" He realised he was rambling, and couldn't help himself; the thoughts just rolled off his tongue, like a warm stick of butter... "Come on, now, Stephen, I LOST MY SISTER -- in a manner so horrible that there was NO BODY TO BURY...!"
Thankfully for him, Stephen's question got his synapses firing properly again, and his mind went into Educational Pedant Mode (TM). "The four conditions to Tosvig's Constant? Well..." And then he recited them succinctly as possible, which -- wasn't very, in fact, considering how beautifully complex the time theory was. "...And finally, though really, this one ought to have been recited FIRST, given the overall breadth of it -- but anyhow... It's the one that's been disproved already -- the theory of Time Inception -- the idea that by going backwards, or even forwards, in time, will create a new alternate timeline that only the people who have travelled back or forwards together have access to -- aside, of course, from the people they create and/or meet within that same timeline...!" He breathed a sigh of relief as he finished -- relief, possibly, at being able to remember such things, even in his blackest of moods!