"Well... this is still private conversation among water brothers, gentlemen.  Lieutenant Agnew was our junior medical officer.  Quite brilliant in his line, Sven tells me, and I had no complaints about him otherwise; he was well-enough liked.  But he had an unsuspected latent xenophobia.  Not against humans.  But he couldn't stand Martians.  Now I had given orders against going armed outside the ship once it appeared that the Martians were peaceful - too much chance of an incident.