While having your partner out, tap the touch screen above your partner's head to make your partner jump (depending if you got the double jump relic, your partner will either jump once or twice). Once your partner is high enough, press X to switch to the jumping character and you will able to jump 1-2 more extra times (depending on whether you have the double jump relic or not) for a total of 2-4 jumps. Most likely useful for sequence breaking.
PICTURE SUBMITTED BY REBORNSAVIOR
If you jump too fast the other will drop down, or teleport to follow you. If you jump too slow the partner will do a double jump themself and you would waste a jump.
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