We don't even get a "There's not much power!" or anything as to why the Enterprise didn't try and prevent the Vengeance from crashing. They just sit there.
That was a big problem. They stop the Enterprise from falling and then they waste 5 minutes to watch Kirk die. In the meantime, the Vengeance falls to Earth as well (and why exactly did it take 10 minutes longer than the Enterprise?), and they do nothing to stop it.