[Yuukigami]

逃げるんだ IS a statement no matter how you look at it. In this case he is telling ごはん that he WILL escape. (lit.)"It is the thing that you escape!". That's why I wouldn't think of it as a flat out command, but if you choose to I guess you can. Although, be careful because context is very important. And because のだ is used for explanation, to show reason ect.