It's probably good to note that on a 2-handle student rig with an SOS system on the reserve side, pulling the reserve handle is a really bad idea under 1000', since this will also chop the main.
To perform a canopy transfer under 1000' on a system like this, you can disconnect the RSL and yank the RSL line itself to deploy the reserve without chopping the main. Or, on the student rig I used, there was enough cable sticking out of the reserve D-handle that I could have grabbed the cable/swage and pulled there, without removing the reserve handle and triggering the SOS system.
Since equipment can differ greatly, it's always a good idea to know your equipment inside and out when considering scenarios like this. :)