[Ian's hands come to rest on Souji's shoulders and he leans down a little, to put them on the relatively same level of eye contact. Being so open about this is bound to be suspicious, but... Ian really needs to know, because accidentally saying the wrong thing at this point could be disastrous.]
Exactly what happened just before you woke up here?
[Hopefully the seriousness of his expression and tone of voice would help to minimise exactly how badly he knows that could be taken. If he'd been asked that question as soon as he'd woken up, well - he certainly wouldn't have been trusting that person in a rush.]