I believe with stock recovery you have to press power + volume up for a moment, then release them simultaneously and it bypasses the red triangle.
Been a while since I have owned a non-Nexus... not sure if that is a Nexus-only thing.
VZW Moto X DE, stock 4.4.4 rooted
Nexus 10, CM11 M
VZW Galaxy Nexus, CM11 M(retired, fancy remote, dash cam, etc)