If that was the intention, then that should be stated. We already know at least Goku and Krillin can bend and control the Kamehameha (Goku vs Frieza, Krillin vs Saibamen). We also know that it can be used for propulsion (Goku vs King Piccolo). If they get knocked out of bounds, they can circumvent the "no flying" rule by quickly firing a kamehameha into the arena and then bending it to catapult themselves back into the ring.
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