Yeah, love those AI interrupters.
I have an ele hero too now (the centaur) but he doesn't seem to be very clever at his skill usage or energy management. He uses Glyph of Renewal on a spell that recharges in 5 seconds. And every fight he gets himself down to less than 10 energy and exhaustion too.
The ranger on the other hand does consistent damage, never runs out of energy (love expertise

) and interrupts spell after spell with Savage Shot, while also dazing. I am a bit annoyed that she dazes absolutely everybody though, even warriors with no spells, or a Mandragor Slither that already dazed itself lol. That's the price you pay for not having a real person that can think.
She also dazes the Mandragor Imps which can be nasty (Plague Touch), but I found out shift+click will stop a hero from using a skill, so not such a problem now.
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On my ranger I just picked Sousuke because I read about using him as an uber E/Me interrupter.
Oh nice, I'll try that.