That means if 2 frogs (middle and one outer) jumped, then the weight distribution of the last remaining outer frog would have been too much, therefore tipping the lily pad off balance and throwing the remaining frog into the water. That was the easy explanation.
Medusa first appeared in Fantastic Four #36 (1965), and was created by Stan Lee and Jack Kirby. She appears first in flashback, then in costume as part of the fledgling Frightful Four. She appears in #38, 41, 42, 43, 44-48 and in various subplot glimpses from #49-62. The Inhumans also appear in Fantastic Four # 82-83, with Medusa.
See More Medusa Pictures >. Medusa was a monster, one of the Gorgon sisters and daughter of Phorkys and Keto, the children of Gaea (Earth) and Oceanus (Ocean). She had the face of an ugly woman with snakes instead of hair; anyone who looked into her eyes was immediately turned to stone.