Is this collusion?

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Hey all,

This should probably go in the zoo but I don't know them and I know you so I'm sticking it here.

Site unimportant. 1/2 6max. 5 handed.
UTG open limps, Hero raises TT, button folds, colluder 1 cold calls in the sb, colluder 2 3-bets in the BB, UTG calls and I call. Four to the flop for 12sb.

Flop is Q 7 2 rainbow.

colluder 1, who is short-stacked bets, colluder 2 raises, UTG folds, I fold, colluder 1 goes all in with 0.75c more than the raise. Colluder 2 thinks until his time almost runs out and then folds.
In the chat he writes, 'One for you bro, lol.'

Colluder 1 has J2, for a pair of twos.

Before I write to support please tell me that I'm not imagining things as I've never seen or had to deal with this before.

Thanks,
Adam.