Waving not drowning

I'm on the train that passes his house and on the phone to him at the same time. He comes outside and waves at the train as it goes past. I'm in the third carriage first doors I say waving back. He laughs. I laugh. The woman standing next to me sees him and also laughs. Did you see me I ask. Yes he said you're wearing a grey teeshirt or something. I am. Tenuous connections, fleeting but lovely. I bet the whole train saw me he says, we have to stop doing this shit. I hope not I think smiling.