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I could go either way. In the large cities, an officer with a bias could "mis-hear" a statement that you make in the heat of the moment at the scene of the attack and get you sunk in court. However, a carefully worded statement made by your lawyer in an interrogation room with video and audio recording could not so easily be misconstrued. This is possible, but much less likely to be a problem in a suburban / rural setting... but then again, being attacked in these settings is also less likely.

However, I can see the value in some basic info such as: "He was wearing X, he came from that direction, threatened me with that knife lying on the ground right there, then he ran in that direction, I would like to be cooperative, but I would like to have my lawyer present before I answer any questions or provide any additional details."

You didn't say that you drew your gun or that you shot anyone, you did not admit to anything, other than being there and seeing something. You should be alright

ETA: Your right to invoke the 5th is intact... just because you have said one thing does not mean that the cops can beat the rest out of you or force you to answer questions. Saying what I have said above does not incriminate you in any way... you have not admitted to anything that you did.. only what the other guy did/had in his hands.