Question: event set in dsolve_numeric

i wan't to compare the result with x1(t)=x2(t) of two ode,then modify v1,v2 in the form diff(x1(t))=v1,diff(x2(t)=v2 ,but the triger seem's fit to either one  of x1(t),x2(t), thus the action can't  excuted on the both,who can help me .

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