FangTheCat The Reptilian would Grit his teeth...
???: "That Mother... The moment I saw him... Hatred cannot describe the pain and anger I felt when I saw that one guard... Didn't you hear it in the Message? The cries of agony as I fought that demon? Those were the cries of those he didn't find useful in the future... So he mowed them all down. All of them. Nothing was spared... I could not let that have a chance to happen, even if that means I had to resort to such feral action!"
He'd sigh before looking away...
???: "That's the thing about people as a whole... They change. You can look at anybody, be it from human history or otherwise, and their biographies will feature a change within themselves, and It'll almost always be for the worst. Through everything I know, There has mostly been little exception... Wait, that reminds me- My god I actually-"
He'd find a nearby waste disposal, however the Remna use it, upon realizing he didn't clean his teeth after biting somebody... It is clear he is ashamed of the action, and especially the fact that it took him so long to realize his teeth has been soaked from such a wrongful attack. After returning in a sweat, he had also dumped out most of his water, due to contamination.
???: "...Sometimes Nature makes a good point. Well then... Do you have any other questions?"
Doctor Roger would be shocked both by the Creature's co-operation, as well as what he is discovering...
Doctor Roger: "Uh... Alright. Can you ask him what year he comes from...? I think that is something that needs clarification..."
In the meantime, The Creature would grumble about his disappointment in himself, as well as, again, a Princess of some kind, for whatever reason.