They were starting to  run out of penicillin, so what they would do  was run with his urine across the road to re-synthesize  the penicillin from his urine and give it back to him, and that worked.
La penicillina cominciava a scarseggiare, quindi prelevavano campioni  della sua urina e correvano a sintetizzare  altra penicillina per poi risomministrargliela e funzionò.