Shakugan no Shana Vol 5 pg 95

‘Glazed Eyes’ Vine, whose senses were far sharper than those of other Tomogara, could feel
the reason for its strength, its terror, more acutely than anyone.
Normally, Denizens of the Crimson World and Flame Haze fought while sensing each other’s
presence.
No matter what Unrestricted Method was used to conceal one’s presence, at close range,
both Tomogara and Flame Haze could sense each other. How subtly one could detect the
tells of movement or the concentration of Power of Existence within that presence… that
was the absolute condition for being a powerful warrior.