In an effort not to slow down role play. If Tazskans, initiative is higher than Cratols then he will step onto the multicolored stone circle.
Otherwise, if Cratols is higher, will wait for him to step off, if applicable.
You, are right Seath we don't have any other option. But to test, each stone circle, in turn. The multicolor one, when stepped on, seems like it may yield a random effect, with a corresponding color.
It may match, the previous color either the blue or grey?