[ There's not a lot else Eren can show her easily. He can make fire as a titan but he's not good at putting it out, so he won't risk it. It's just crystal, the spikes, something that looks like a literal hammer (only titan sized), and the way he can harden something and then move out of it, leaving behind the shape of whatever it was (a foot, in this instance).
He can also dissolve the crystal so it won't just stay there forever. It takes some effort to make sure that Evangeline's little spike stays as the rest dissipates into steam.
When all of that display is over, he sets her down and moves a safe enough distance away to return to being himself. He pulls himself out of the back of the kneeling titan's neck and slides down to the ground, titan body dissolving as well, the steam obviously hot even from a ways away.
He goes back to Evangeline again, face streaked with telltale marks. They'll fade eventually. ]
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He can also dissolve the crystal so it won't just stay there forever. It takes some effort to make sure that Evangeline's little spike stays as the rest dissipates into steam.
When all of that display is over, he sets her down and moves a safe enough distance away to return to being himself. He pulls himself out of the back of the kneeling titan's neck and slides down to the ground, titan body dissolving as well, the steam obviously hot even from a ways away.
He goes back to Evangeline again, face streaked with telltale marks. They'll fade eventually. ]
How's that?