Monokuma had thrown several leaflets, they contained several rules on them, in a sense, it looked like a four year old had drawn them, could Monokuma really be that childish?
Nonetheless, Theo picked up that leaflet and slipped it into his pocket. He noted that one was left on the ground, most likely it was intended for Lunas' as she didn't pick one up, rather, she stormed out of the room immediately afterwards.
Everybody pretty much left, "If you have brains, join us in the library", "If you've got guts, help us find an escape route". Unfortunately for Theodore he really had nether of those traits. In the end he decided to leave and go to his room, like the previous guy, James had, although he was abit more eccentric.

"I'm going to go to my room... Not any of you care..." He left the auditorium, rather quietly and depressed at that. Walking through the the hallway... was strange it was eerily quiet and strangely lit, with an assortment of colours. He noted the sign reading 'Despair Dorms', dorms would imply that area has several rooms available. He remembered that Monokuma told them that they all had assigned rooms, much to his delight he entered the area, not noticing the obscenely large red doors at the end of the corridor. 
(My own room, that's great, I guess). 

To find you assigned room, you walked past the cafeteria to a series of doors that had names and an 8pit like tile of the person it intended for. Look for his, Theo walked past a few doors, once he found it... His neighbors were the Ultimate Strategist and the Ultimate Cadet. (So these are my room, no not room mates, um, neighbors, I guess...)
Opening his door he found what was a fairly ordinary room. Perhaps he could ad his own personal touches? He didn't plan on killing anybody, so he had to prepare for this long argues task of living in the academy... It felt obvious to him, there was no escape. No escape, unless you killed somebody, or were killed yourself.
"Oh! A Bathroom! Maybe... I can have a shower, they say all good thoughts come during a shower. As he turned the door knob open, he heard a 'zoom' noise. It was camra in the corner of the room... Did it just... Zoom in on him? He imagined Monokuma watching him... "Upupupu" (HYA! NEVER AGAIN!) Theo quickly ran in and slammed the door shut. To his relief there were no cameras in there, it was a fairly ordinary bathroom, white towels, a sliding glass shower. He threw his clothes of and hopped in the shower, letting the steam settle before getting wet.
"Mmmm... Kill, or be killed... At the rate I'm at, I'll probably be an easy target... I have no guts... No brains... Perhaps... Perhaps I can fake it..." He let the hot water drench him and had some deep thoughts in the shower.