This was intolerable. That old man had more magic inside him than should normally be feasible or safe. 

(He probably farts actual sparkles.) He grumbled inwardly, as he ripped the curtain down from the window and looked outside, specifically to see how far down the ground was.

Thankfully, being on the ground floor, the window's hight inside was only just a tiny bit different from the height outside: about 3ft-- just barely enough to touch claws on the ground outside. He chuckled-- the old codger wants to use magic indoors does he? Well, two can play that game.

He scooped out a small pinch of what was inside his seed pouch, not having much time to carefully pick and choose, given the escalating chaos going on inside, then bent over as far as he could with his right arm through the window to scratch them in and give them some juice. He'd have to try manually controlling their growth from inside the dining hall, once they were up and through the window.

He doubted his ability to just overpower this old fart. This would be more like trying to overpower his old man back home, and that was like fighting the whole forest at once, the kind of magic his dad could tap into.  He was limited here by what his own body could naturally produce in a day, unless he could set up and use a harmonized planting to expand his pool, or set up semi-permanent effects to keep the old bastard busy with.

He grumbled under his breath, and wondered about growing the vines further out, and away from the keep to where he had set up such plantings the night before... it would be tiring to send the vine tendrils that far on his own, but once they were in the right areas, he could tap them through said vines, allowing him to better control them indoors...

Maybe he could weaponize them against the old coot, and just drain the old man's energies directly? Surely he'd have to be overwhelmed other ways first before that could be effective? Maybe different kinds of vine could be leveraged in a makeshift way, without the benefit of better selection or planning?

He had 'cucumbers', 'passion fruit', 'greenbier', grapevine, and 'brier rose bush'. 

Cucumber and passion fruit would make a good place to 'dump' magic.. they would bear quickly and prodigiously. Grape and greenbrier were woody.. the latter being weedy and spawling, the former slower growing but tougher and deep rooted... then the rosebushes. Bushy, perennial, woody and resilient.  He wished he had some acorns, or some deciduous tree seeds, like elm, hackberry, maple, or locust... ash, or yew would be good too, but he would really have to be outside for that...

His reverie was interrupted by the tempest suddenly getting its ass kicked. Whatever he had to do here, he had to do it quickly.

Maybe if, instead of being carefully planted, the vined could be carefully positioned? Alter the resonance in the room, and passively drain magic outside?

It was worth a shot...

He dumped a nearly unsafe amount into the mix of haphazardly sown seeds, causing a small explosion of greenery to erupt and spread. Roots tangled together haphazardly until he redirected and ordered their growth so they wouldn't compete (as much). Greenbrier roots tunnelled through the ground sending up little leafy stems here and there, before worming underneath the wooden wall of the palisade, and toward the east. That side had the most sunlight this early, and he hoped enough of the harmonized planting remained to tap into... he'd need it to complete this plan without popping a bloodvessel from trying too hard...