When a timer executes the /timer -e command against a different timer, its own 'halted' message is suppressed. If you edit the timerbar's command from "timerfoo -e" to "timerbar -e" the 'halted' message does display.

Code
//timerfoo 10 5 echo -ag foo reps $!timer(foo).reps $!time | /timerbar 5 2 timerfoo -e | timerfindbar 1 15 timerbar