Suggested by Silver Remoraid:
Steven and Lars fuse during the trial.
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Steven ran over to Lars while Blue and Yellow argued. "This is our chance, we gotta go!"
Lars' eyes remained locked on the two diamonds. "Where...?"
In response, Steven pointed to the palanquin. "There!"
Yellow's voice echoed through the air. "Let's shatter Rose Quartz and be done with it!"
At that, Steven grabbed Lars, and looked at the palanquin. Lars grabbed his shoulder. "Steven..."
Both males looked at each other, and both had fear in their eyes.
Steven grabbed Lars' hand. "We gotta run."
A confident nod came from Lars. "I'm with you."
There was a glow that surrounded them, and a burst of pink smoke erupted from them. Both diamonds stopped arguing and turned to look at them.
The new fusion gasped, and looked at himself. "Woah...what is this? Did we... we FUSED?! This is-"
He stopped and looked at the diamonds. "Oh..."
Yellow sneered at him, and her electricity shot at him. A gasp escaped him, and he quickly covered his face.
When nothing happened, he looked out, and noticed a pink color over everything. "Oh! My bubble. Right, we gotta run."
The fusion rolled to the palanquin, and the bubble popped. When he jumped up to the control panel, he nodded. "Ok. Now what?"
He reached for the control pad, and it did nothing. "Oh man...do I have too much human in me for this?"
Now, Blue diamond raised her hand up. A ball of energy formed in her palm. "Stop right there!"
As the ball shot at them, the fusion gasped, and a wall of pink energy rose in front of the palanquin.
The fusion glanced at his gem. "Right...gotta split just right..."
The glow returned, and Steven and Lars seperated.
Lars sat up right away. "Steven! Get us out of here!"
Steven nodded. and the panel glowed. "I got it! Now...this should work..."
As the palanquin started moving, the pink wall crumbled.
A nervous sound escaped Lars. "We gotta go now!"
He knelt next to Steven, and stared at the diamonds. Both stepped towards them, and he cried out nervously.
Now, Steven swiped his hand upwards.
The control panel glowed brightly, and the doors closed.
Before the diamonds could get any closer, it jumped into the air, crashing through the cieling.
Both males yelled slightly, as they started to fall back down.
Lars looked out at the area with wide eyes. "Where is this?"
Steven felt a pit in his stomach. "Homeworld."
There was a burst from the wall, and Yellow diamond glared at them as they fell. "You think you can get away, Rose? You may have held our own on that spec called Earth, but you're on our world now."
At that, both males held onto each other, as they fell into darkness.
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Sad we never actually got to see this. Hope I did it justice :)