If it has sufficient funds to rent, he should rent; Rav follows his ruling - ואם יש בדמיה לשכור ישכור רב לטעמיה
Regarding a collapsed house (which is meant to be rebuilt), the owner is not required to provide him with another house (with the money of the ruins), however by a dead donkey whose carcass is meant to be sold, the owner is obligated to buy (or rent [according to שמואל]), with the proceeds of the carcass.
If you will say by unspecified wine and this ship; if he gave, why should he not take, let him say to him, bring me your ship and I will bring wine - אילימא ביין סתם וספינה זו אם נתן אמאי לא יטול לימא ליה הב לי ספינתך ואנא מייתינא חמרא
Paying for half the way is justified only if the renter benefited from it (as in the case of the חמור), but not if no benefit was derived (the sunken wine in the ספינה).
Rather by an unspecified boat and this wine; if he did not give, why should he not give; let him say, ‘give me wine and I will bring a boat' - אלא בספינה סתם ויין זה אם לא נתן אמאי לא יתן לימא ליה הב לי חמרא ואנא מייתינא ספינה
Where the employer and employee were both equally aware of a possible calamity, the employer need not pay, unless the employee suffered an actual loss, where he is paid כפועל בטל.