Galen remembered back to his early days of metalbending training. While many other instructors believed that the best way to bend was by simply guessing at the earth content of a metal by intuition, which was quick but not overly efficient, his own humble teacher practiced another method using another source of knowledge about the earth and metal he was bending:vibration. From this, Galen learned the finer manipulation of earth and metal on a small scale, but it also came with another skill as a side effect. Vibrations travel, through the earth, through people, and as a result, so do their pulses. The deliberate pulse of a prideful worker, or the quick pulse of a mail runner. Or in this case, the fleeting pulse of a liar.
"You are lying." he said to the sergal with a slight look, before changing focus due to the present concerns.
Turning to the fox, he asked "I am sure you might be willing to contribute a bit of worthwhile information? What happened?"
The claws on his right hand twitched slightly in agitation.