No worries...walk around with Buki slowly...you should find a wall with the flower and creeping ivy for Buki to climb it.
First thing you should do though, is keep refilling Elco's jet-pack and fly all around...there are hidden treasure chests and vats and barrels to break in the pits.
Once you plcae Elco and Buki on the hightlighted circles in the ground the door will open.
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