Is it just me, or is 'Victor Sells' Heart-Exploding Spell' (YS301) estimate of the shifts necessary to fill a stress track significantly more than would be indicated by the stress rules on YS202?
'Heart-Exploding Spell': "...plus 10 shifts to fill up a
strong physical stress track (4+3+2+1)..."
YS202: "When your character takes stress, mark off
that box (and only that box) on the appropriate
stress track." (bolding added, italics original)
Which, at that point, would be the TENTH stress box, not the fourth, third, second, and first, combined. And since the target, assumedly, does not have ten stress boxes, they're going to be good and taken out. By a rather significant margin.