The base of the transistor is grounded through R6. The other end of R6 is Vss, meaning ground.

To Reset the system you have to feed high to the transistor in this circuit.

I am a bit worry about the collector that is connected to a 100 ohm and this to the programmer. In programming, there might be 13 or more volts. At this time you have to be sure that the transistor will be in OFF state, that is [/MCLR Slave from master PIC] be low. If you can be sure of this then I see no problem.

Ioannis