From experience - It the form felt 'primal' and had a 'gravity' (can't think of a better word to describe it) it would seem likely the horned God.
If you summoned divine energies into a protected circle, you invited him in. Certainly if you cried 'Io evohe' which was an estatics cry to Dionysus / bacchas in his ancient rites.
An intruder? Unless you were clouded by a negative outlook or emotional malaise when entering into your 'workings' then it's unlikely to be an intruder of this type.
Its quite a blessing to meet the horned God. What purpose he had you have yet to discover or develop - a door has been left ajar for you - yet I would imagine it has little to do with the minutia of your actions and everything to do with the foundation and the sentiment... Or you tapped into something primal.
You are not beneath his attention - no-one is, his blood is our blood - whether you are able to channel the higher aspects of his primal energies or fall to the lower (as all deities have high and low aspects) is something you must come to terms with.
Our relationships with deities are not unlike our relationships with people and the dynamics of the relationships you seek are often the ones you find (even if defined subconsciously).
... Then suddenly the Mole felt a great Awe fall upon him, an awe that turned his muscles to water, bowed his head, and rooted his feet to the ground. It was no panic terror—indeed he felt wonderfully at peace and happy—but it was an awe that smote and held him and, without seeing, he knew it could only mean that some august Presence was very, very near. With difficulty he turned to look for his friend, and saw him at his side, cowed, stricken, and trembling violently. And still there was utter silence in the populous bird-haunted branches around them; and still the light grew and grew.
Perhaps he would never have dared to raise his eyes, but that, though the piping was now hushed, the call and the summons seemed still dominant and imperious. He might not refuse, were Death himself waiting to strike him instantly, once he had looked with mortal eye on things rightly kept hidden. Trembling he obeyed, and raised his humble head; and then, in that utter clearness of the imminent dawn, while Nature, flushed with fulness of incredible colour, seemed to hold her breath for the event, he looked in the very eyes of the Friend and Helper; saw the backward sweep of the curved horns, gleaming in the growing daylight; saw the stern, hooked nose between the kindly eyes that were looking down on them humorously, while the bearded mouth broke into a half-smile at the corners; saw the rippling muscles on the arm that lay across the broad chest, the long supple hand still holding the pan-pipes only just fallen away from the parted lips; saw the splendid curves of the shaggy limbs disposed in majestic ease on the sward; saw, last of all, nestling between his very hooves, sleeping soundly in entire peace and contentment, the little, round, podgy, childish form of the baby otter. All this he saw, for one moment breathless and intense, vivid on the morning sky; and still, as he looked, he lived; and still, as he lived, he wondered.
"Rat!" he found breath to whisper, shaking. "Are you afraid?"
"Afraid?" murmured the Rat, his eyes shining with unutterable love. "Afraid! Of Him? O, never, never! And yet—and yet—O, Mole, I am afraid!"
Then the two animals, crouching to the earth, bowed their heads and did worship.
Sudden and magnificent, the sun's broad golden disc showed itself over the horizon facing them; and the first rays, shooting across the level water-meadows, took the animals full in the eyes and dazzled them. When they were able to look once more, the Vision had vanished, and the air was full of the carol of birds that hailed the dawn.
As they stared blankly, in dumb misery deepening as they slowly realised all they had seen and all they had lost, a capricious little breeze, dancing up from the surface of the water, tossed the aspens, shook the dewy roses, and blew lightly and caressingly in their faces; and with its soft touch came instant oblivion. For this is the last best gift that the kindly demi-god is careful to bestow on those to whom he has revealed himself in their helping: the gift of forgetfulness. Lest the awful remembrance should remain and grow, and overshadow mirth and pleasure, and the great haunting memory should spoil all the after-lives of little animals helped out of difficulties, in order that they should be happy and light-hearted as before.
- Piper at the gates of dawn (wind in the willows)