Its main drawback lies in its autonomy, which will sometimes prevent Sheer Heart Attack from prioritizing killing Kira's intended human target(s). Like Killer Queen's first bomb, Sheer Heart Attack's explosions remove all physical evidence of the target. If Sheer Heart Attack's explosion was set off by a non-human source, it will continue to seek out targets until it explodes from a human.

It seeks out whatever the warmest object in the vicinity is, even changing targets the second a warmer object appears upon reaching its target, it automatically induces an explosion with power and blast size equivalent to the heat of the target. It is completely autonomous and has a great range, so Kira can safely engage Sheer Heart Attack and move a great distance away while it carries out its duties. Because Sheer Heart Attack is bound to Kira's left hand, Killer Queen's Primary Bomb can still be used when Sheer Heart Attack is active. As a result, any Stand abilities activated upon it are reflected onto Kira's left hand. Sheer Heart Attack is a heat-seeking automatic bomb that detaches from Killer Queen's left hand. Sheer Heart Attack searches and destroys the warmest object in the vicinity

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