Boot camp did not reboot into Windows installer
Hi. I'm attempting to install Windows 10 on my early 2015 13" Macbook Pro, El Capitan. The boot camp assistant went through partitioning and rebooted, however it rebooted into OS X and not into the Windows Installer. The ISO was downloaded straight from the Windows website without issue (Win10_1511_2_EnglishInternational_x64, 4,46GB file). When holding down the option key while booting only the Macintosh HD shows, no sight of the BOOTCAMP partition even though it's visible under storage.
My Macbook is the most expensive thing I own and I'd like to avoid bricking it if possible, so I'd appreciate if someone could walk me through this. I desperately need Windows installed so simply not fixing this is not an option. I've attached a screenshot of the partition under storage, though I don't know if that would be any help.
MacBook Pro with Retina display, OS X El Capitan (10.11.5)