I totally agree. This is an amazing bit of genius added to the game, and I am oh so excited to play as a mage! Although, it does make me wonder. The flame spell hardly used any magicka at all, even when spouted for 10 seconds, but the detect life spell drains mana very quickly. Maybe someone can tell me why?
Might be linked with the players ability in that school of magic... which would make sense actually..
High destruction skill = longer spells
Low 'alteration/illusion?' (which one was detect life?) = more magic used to keep it sustained..
This actually makes it even better if there's truth behind it