Nazir

Resh Lakish raised an objection against R. Johanan [from the following]: If a dove of an indeterminate pair  should fly away into the air, or amongst those sin-offerings that have to be killed,  or if one of the pair should perish, a partner is to be taken for the other one.  [This implies that] with a determinate pair there is no remedy;  though all other pairs [in the world] would be valid.  Now why should this be so? Should we not say of each one, perhaps this is one [that flew away]?  He replied: I spoke of a woman who is stationary and you raise objections from prohibited things that are mobile!  Should you argue further that here too the woman may be mobile, for it is possible that he may have met her in the street and betrothed her, [the cases are still different] for the woman returns to her customary place, but can the same be said of the bird-pair? Raba said: R. Johanan would admit that a woman who has [among her unmarried relatives] neither daughter, daughter's daughter, nor son's daughter; neither mother nor maternal grandmother, nor sister, although she may have a sister who was divorced after [the representative was sent] — such a woman would be permitted to him,  because at the time that he gave his instructions, [the sister] was still married, and when a person appoints a deputy, it is [to perform] something that is possible at the time,  but for something that is not possible at the time he does not appoint a deputy. We have Iearnt: [SHOULD A MAN SAY:] '  DECLARE MYSELF A NAZIRITE, AND I UNDERTAKE TO POLL A NAZIRITE,' AND SHOULD HIS COMPANION, HEARING THIS, SAY: 'I TOO, AND I UNDERTAKE TO POLL A NAZIRITE, THEN, IF THEY ARE CLEVER, THEY WILL POLL EACH OTHER; OTHERWISE THEY MUST POLL OTHER NAZIRITES. Now this [suggestion]  is all very well as regards the latter, since the former had become [a nazirite] first,  but as to the former, was the latter a nazirite [when he made his vow]?