What is the main force of lam yanḍaḥ bi-māʾ fa-yughsal?

Imruʾ al-Qays: The Hunt’s Outcome, Preparing Meat, and the Return (Verses 65–69)

• The horse sweated enough to need washing
• The horse’s exceptional stamina despite the chase
• The horse tired and stopped pursuit
• The herd ran only toward water