First , he tried to force Heero to test the Wing Zero behind Tsubarov 's back .
This backfired when the System overwhelmed Heero 's mind , and only Quatre was able to stop Heero from going out of control .
First , he tried to force Heero to test the Wing Zero behind Tsubarov 's back , but this backfired when the System overwhelmed Heero 's mind , and only Quatre was able to stop Heero from going out of control .