Considering loomis stated that Caleb left and took the radioactive suit with him and he was wearing the suit at the waterfall when he slipped, makes me believe that loomis let him drop and the suit then became damaged so he figured to get rid of both Caleb and the suit saying that he just left with the suit and then stated that Anne could keep all his things not because he wanted to keep them but because he wouldn't need them now that he is dead.