じゃあ、わざわざ"steal blood or life"って書いてある場合があるのは何なんだ、って話ですが。
6.4.5. Strike Effects
Steal Blood. This effect moves blood counters (or life counters) from the target to the striking minion. This does not count as damage, so the effect cannot be prevented with damage prevention effects. This effect occurs before the "heal damage" step of damage resolution, so the stolen blood can be used to heal damage even if the damage is inflicted simultaneously. If the stolen blood causes the striking vampire to have more blood than his capacity, the excess drains off immediately (as usual).
Cohn Rose enters combat with a mage ally. Cohn has a capacity of 5 and has 4 blood. The mage has 2 life. After determining range, Cohn steals 3 blood as his strike. The mage strikes for 2R damage. Two life counters are moved to Cohn from the mage, and Cohn sustains 2 damage. Cohn has 6 blood, but his capacity is only 5, so 1 blood is moved to the blood bank. The mage has no life counters remaining, so he is burned. Cohn has 2 damage to deal with and doesn't prevent any, so he burns 2 blood to heal the damage, leaving him with 3 blood.