Yes you can deploy another AP at the end of the first one.
The catch is (in my deployment) you need to turn off the 2.4 radios. This will pull the wattage down to an acceptable level.
I used this several times at an event and actually connected 4 ap's with a second POE injector feeding an additional 2 ap's at mid point.
you have to use ruckus' 60 watt poe injector.