How can I (twice now) receive challenges three times from the same gladiator in the span of just 1 or 2 minutes? I thought there was a cool down?

Here's the most recent:

[Jan 03 10:33 am] ARENA - Thurthulthith vs Yihue
[Jan 03 10:33 am] ARENA - Thurthulthith vs Yihue
[Jan 03 10:33 am] ARENA - Thurthulthith vs Yihue

Yihue challenged all three times. Huh? Whar cooldown? Whar?

This happened yesterday with another warrior as well.