tokens: ACKNOWLEDGEMENTS We thank an anonymous referee for a careful reading of the manuscript. We benefitted from numerous sisyphean conversations about the grey area between explosions and winds with Stan Owocki, Dave Arnett, Eliot Quataert, and Chris Matzner, and informative conversations about binary L2 mass-loss and mergers with Ondrej Pejcha, Stephen Justham, Kaitlin Kratter, and Philipp Podsiadlowski. We have also discussed binary evolution, on occasion, with Selma de Mink. NS’s research on Eta Carinae’s light echoes and eruptive transients was supported by National Science Foundation (NSF) grants AST-1312221 and AST-1515559. Partial support for this work was provided by NASA grants AR-12618, AR-14586, and GO-13390 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. Support for JLP is provided in part by FONDECYT through the grant 1151445 and by the Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. DJJ gratefully acknowledges support from the NSF through award AST-1440254. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This project used data obtained with the Dark Energy Camera (DECam), which was constructed by the Dark Energy Survey (DES) collaborating institutions. Funding for DES, including DECam, has been provided by the U.S. DoE, NSF, MECD (Spain), STFC (UK), HEFCE (England), NCSA, KICP, FINEP, FAPERJ, CNPq (Brazil), the GRF-sponsored cluster of excellence ‘Origin and Structure of the Universe’ and the DES collaborating institutions. This work makes use of observations from the LCO network. Based, in part, on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil) (Program GS-2014B-Q-24).
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