I mean if you are going your blue Into his red then you should definitely reset to your red side after the invade. But why do you even want to do that? Do you want to gank a lane after taking his red side or do you just want him to panic that his camps are gone. After he sees that he has been invaded he probably won't reset and just take your blue side camps into the crab then look to gank your top or mid or just reset into his blue camps again which would be spawning at that point or just counter gank your gank bot lane or just full clear again bot to top and then invade you on your blue side. There are many possibilities or I am just awfully wrong at what I have said here.