Some two years into the clone wars, Obi-wan goes missing during a rather violent surprise attack and is declared dead despite the ranting of his (clearly unbalanced and heavily grieving) padawan.
Anakin, for his part, is so totally out of his mind with worry and outright fear for the fate of his Master (Is dead? Is he alive? Why can't I feel him in the force? Surely if he died I would know . . .) that he hardly remembers the following months, save for his stubborn entreaties to anyone and everyone to just let him go, let him look, and he'll find him –
In the end it is a mere matter of coincidence. Obi-wan – starved, beaten, and tortured beyond any reasonable point of sanity – has somehow (Force only knows) rescued himself and his fellow prisoner, clone trooper #A345-17 (whom he affectionately calls Alpha).
Despite the fact that he has spent upwards of seventy days at the mercy of a particularly vicious sith acolyte who, on top of everything else, has a very personal dislike for him, Obi-wan has come away from the encounter with nothing more than a disheveled appearance, a decreased muscle mass, and enough injuries and extenuating medical problems to keep him in the healing ward for a solid month.
Anakin has spent so much of his time, so many of his nightmares, envisioning the empty, soulless eyes that marked the torture victims set into the face of his Master, that he is, by turns, almost reverent with thankfulness that his worst fears were never realized and apoplectic with joy that both their ordeals are finally over with and he can have his Master back.
Of course, of course, Obi-wan wouldn't give up; wouldn't stop fighting for a way out – a way back. He was part of The Team, after all.
Anakin laughs through his tears, hugging Obi-wan close, deaf to man's obligatory protest about PDA in front of impressionable clones.