In holic Watanuki was warned not to become the "E" (bait), so naturally he became the E. Then again Yuuko Was kinda vague >.>. ANYWAY! as bait he drew a posessed girl to attack him with a knife - that was the bait bit, long story but he became the focus of the girl/spirt's wrath. Doumeki saved him and the spirit (thing) left the girl, her soul along with it.
The Bait draws/attracts something (often dangerous) to them.
That seems badly explained -.0- not very articulate today
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Syao-kun is drawing something out or attracting something.
SUBARUUUUUU!!
SyaoranXKamuiXSubaru 3 way love fest O.o