So as many of you know I got a little now 10 Month old filly named Callie (the reason why I'm not online much anymore)

We have her in her own pasture because the other horses are iffy with her. Pete the mini is OK besides trying to chase her every once in a while. Cassidy the made is surprisingly OK besides the occasional beat up (she's a beast of a mare. I don't trust her at all) and Bandit the docile gelding I thought would be OK but has the worse thing with her. First time they were put together, I wasn't there. Apparently it was bad. Both rearing up on each other, tearing across the field, her jumping the metal gate and denting it. 

Second time was not as bad, but mostly him chasing her and drawing blood as he bit her.

Third time I was there. I worked him hard for 3 hours and I put a stud chain on him, and she first went up and started.... Chewing with her mouth open is now I can best describe it

I hold him on the chain for a while until I'm told to let him go. He goes straight for the hay, she goes to hide with me. 

After 5 minutes, out of no where, he takes off after her. They're in the bigger pasture this time, so she's outrunning him with ease as he tries to keep up. The only time he's able to catch her is in corners and when he's a klutz and slips in the mud. We eventually call him off and he canters toward us but then beelines back for her and they both come thundering up. She launches herself at the heavy metal gate (I had a saddle pad hanging so she didn't ingure herself I hope) and him jumping on her broke the gate. She fell to the concrete and skid and hit the metal garage door, got up and ran between where I parked the golf cart and the other door. He's too fat so he didn't fit, plus at this point he's in range so I'm popping him with a Bebe gun. He retreats back to the pasture, she comes running over to me.

Any tips? He's in the back pasture with the others in a separate pasture so he's alone, I might leave him in the back pasture and put the rest in the front so they can touch noses and get along. He's really pissing me off though, he was gelded rather late but he's just stupid. 

She's going to bypass him in a few months, he's already small to start off and she's 10 months and her legs are as long as his and her head is huge. Her parents are massive. I just can't wait till she comes back from the trainer a full blown beast. The way she was leaving him in the dust, I might turn her into a barrel horse. 

I have no advice for this but I hope you can figure something out.

He's been in the back field since 4 yesterday, got a slice of hay instead of hay and feed. 

just give it time....my moms mule for.some reason doesnt like my filly either but its because they know they can push em around...once she gets bigger and sticks up for herself he will leave her alone....dont rush anything!!!

Part of the issue is probably the late gelding. Even though he doesn't have the parts anymore, other horses can still sense it off him.

Today I'm putting him in the back pasture with the other 3 in the front to they can see eachother and touch noses but not kill eachother.

yes, that's the main problem. Why they waited so long....... i don't know. Makes for trouble now for sure

anpther question.... What is the term called when she was nose to nose and chew/breathing into his nose?