Grapple-Bomb Hanging
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By having a (power) bomb boost Samus while she is grappling, she enters a weird glitched state. There is a lot of lag in this state frequently, especially with certain actions.
Canceling grapple leaves the state. Pressing backwards will cancel grapple and leave the state.
Perhaps the most notable applications are that transitions can be triggered (allowing Grapple Teleportation), and dash speed / boost counter are not reset. I am not quite sure about details on this second point, all I know is it works.
Note that Bombs are not necessary to enter this state. Instead, Samus can Grapple something on the frame knockback ends. This is more helpful for speedkeep purposes, but is not as viable RTA.