I don't know does the above valid characters i trying to describe and may help you or not but...
As far as i know the real Tylototriton wenxianensis not only never goes for breeding into the water during the breeding season, but instead afraid of water at all. They even clutch eggs usually on the shore near the water and not directly into water. More of this 5 specimens I had for last time was lethargic and show no any activity, each movement of any of these is very-very slow.
But as for Echinotriton asperrimus (= vietnamense) they are not only active species under water but also able very quickly to move on the ground, found into water where they mate and clutch and can easily escape if you not manage to catch them quick down to deep. I observe the described behavior personally during my research trip to N. Viet Nam this year. It was even not simple to make good shots of the last species, not like you can settle Tylototriton wenxianensis at display and it stays like this for hours...