Hatzaloh and use of goyim to avoid violating Shabbos

 When I lived in Brooklyn I davened on Shabbos at the shul of Rav Dovid Cohen who served as the posek of Hatzaloh. He would always ask Rav Moshe the big issues. I Remember one Shabbos he spoke saying he had just asked Rav Moshe whether they needed to use goyim to avoid violating Shabbos. He said that Rav Moshe had emphatically said no because a goy is not as concerned about saving a jew as a Jew is and the delay in treatment might be fatal. He said he never saw Rav Moshe so angry because he was so upset about the question